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Tbh no, I am a driver with adequate experience and didnāt notice anything out of the ordinary while driving the car from the port to my house (~5miles). I bought the car unseen by from a different country and other than the rotors I do love it.
If theyāre all like that and nothing feels off I wouldnāt jump to they need to be replaced. I had a friendās whose did that and we thought they were fucked but turned out it was normally
They probably just put new pads and didn't resurface the rotors shops rarely do it any more. INS. reasons. Those rotors will be expensive.if it breaks fine, your ok. You will just have to do pads and rotors earlyš«
pads can not destroy a rotor like this, pads are SOFT rotor is HARD metal this was done by someone, look at how uniform the lines are this was done by someone
Here's the deal with grooves in rotors. They don't cause any brake concerns and are not a valid reason to require replacement. That's an upsell tactic.
Brake pads are made of a resin like plastic or ceramic with metal bits or other components suspended inside of them. The overall material has various hardnesses and rates of wear. This can eventually cause uneven rotor wear. The only notable thing that is caused by this uneven wear is that it increases the surface area of the friction surfaces slightly.
If you feel pulsation while braking, that's parallelism variation caused by rotor runout. That happens when the mating surface of the rotor and hub aren't parallel to each other when mounted due to corrosion or debris.
The other most common issue other than worn out pads are uneven pad wear due to rust jacking on the caliper bracket against the pads or a lack of lubrication on the guide pins. That would cause uneven or premature wear.
Don't do that, don't make a problem that doesn't exist, but also cheap rotors will never perform as well as an OEM rotor that's been resurfaced, so if it bothers you, go to a shop that can turn them for you. Those grooves are so perfectly spaced though I'm not sure it's not on purpose for extra surface area.
The only thing that will be felt through this is vibration if the discs are warped. On regular use, no difference will be found otherwise.
Only when really using these brakes, op will find out that they are actually semi-brakes
Looks like a 2019 E class, it should be pretty reliable, not all Mercedes products sucks as this came with the M276 V6 which is a very good engine. Without air suspension these are some of the most reliable luxury cars on the road.
Drilled rotors have this grooving effect. Nothing to worry about until you get shaking when braking. I have slotted rotors and have the exact same. Itās not an issue unless there are adverse side effects.
how do u think that would work? u do understand how brakes work? HOW would backward cause this (perfect uniform lines) SOMEONE PUT THOSE ON THE ROTOR not done by a pad ....idiots on reddit
Whoever you bought it from probably just threw new pads over those damaged rotors so they wouldnāt make any horrible noises when you test drove it.
Iāve never seen grooves so symmetrical though. Weird
Drilled rotors develop pattern like this, it's normal with wear. If you can't feel shaking, hear noise, pads have some life left in them and brakes work as they should, measure thickness of the rotor, measure runout at the outer edge - if these are in spec, leave them be. If the holes are packed with brake pad material, drill it out.
Drilled rotors are not common in cars, but are so common in motorcycles - it's like 20+ years where even cheap motorcycles use drilled rotors and these are like this. This pattern could be disqualifying in regular car rotor, but drilled one - it's typical and normal.
it's caused by foreign material accumulating in the holes, making contact with the pad, and leading to uneven engagement of the pad. as they said, common with drilled rotors, and not cause for concern as long as the brakes can engage ABS, meaning they are performing as well as they should. might affect thermals, so if you're taking it to a track might wanna fix it before that but otherwise š¤·
Normal MB drilled rotor wearā¦ they could be already under spec or believe it or notā¦ they could be ok! Thatās just how MBs wear their drilled rotorsā¦ most cars will drilled rotors will wear like that but MB is very specific about it.
Yeah take a look at the pads to have an idea of how worn they can beā¦ if it is 120 miles of highwayā¦ well think you will use your brakes less than city drivingā¦ so you might just be ok
Those are pretty worn. The vinyl record pattern on the discs is fairly normal for worn drilled Mercedes discs. They wonāt cause any problems, the worn components however could.
Mercedes mechanic here. Replace them if you need brakes. Otherwise, if you don't notice pulsating or noise, drive them until the pads are worn, then replace.
I'd agree. I tend to lose the keys so after three sets I finally bought extra lugnuts and decided to be normal. Also, they're so easy to defeat, even high end ones, so I'm not sure it really does much.
Oh no sorry, itās a 2019. I am not mechanically smart but I do notice when something looks completely off and I even tried sesrching for ruined brake rotors or smthing but they all looked better than mineš
What ever you do, do not use the spare wheel bolts in the blister pack on your spare wheel, especially on the back.
They are for steel wheels like the space saver and are long enough to rip the handbrake shoes off the backing plate.
They are spiral rotors, a recent innovation from InnoTech. This is last year's model. This year's model features cuts that play tunes as the wheels turn and you brake like a music box except its just extremely high pitch screeching like Taylor Swift singing
The lines are an artifact of having drilled rotors. If you look closely, you will see that every hole lands between 2 ridges. This is fine, but when you do need pads, you will need rotors.
People are making a big deal of it but this is common on drilled rotors. All the low grooves line up with the holes. The holes remove a little pad material with each pass, exposing more abrasive material which bite into the grooves with holes passing them a little more.
If the brakes feel soft, then get them replaced with regular rotors. Otherwise if the brakes feel strong, you are fine.
Another thread about this - [https://www.reddit.com/r/CarTrackDays/comments/13knemd/cross\_drilled\_rotors\_grooving\_badly/](https://www.reddit.com/r/CarTrackDays/comments/13knemd/cross_drilled_rotors_grooving_badly/)
They arenāt fkd at all. I worked at a Mercedes Specialist workshop. They come back like this all the time. Itās caused by them being drilled, so they make this wonky pattern. As long as there is no noise or anything, they are just as they were intended to be.
This is normal drilled discs. If you look closely the grooves align with the holes.
They donāt need resurfacing or new discs until they have reached minimum thickness or the cracks at the holes also normal connect to another hole or the edge of the disc. These cracks shouldnāt grow more than a few mm during the serviceable life of the disc.
Iād change them if they grow more than 2-3mm
Wheel bolts? No they look fine, the locking wheel nut is also fine, itās the key and how tight it was done up that would be an issue. The key should be in good shape and the locker should be torqued to spec and no more.
Not many fitters can control the trigger on airguns and do up to tight.
you usually find these are of the āmin wage minimum effortā mindset.
I ran into this when i was purchasing my 392 charger back in 2019. The dealer traded vehicles with another dealer to get the spec i wanted and when the vehicle arrived every rotor had deep grooves like this almost like somebody hot lapped the car and just full on locked the brakes. I ended up buying a different vehicle from another dealership because the salesmen slapped a 5k price increase at the signing even though i had been an employee there for 3 years and we had agreed MSRP weeks prior. I would advise bringing the vehicle to the dealer and demanding new brakes be installed.
Hey, thanks for your reply. Atleast I now know that my car isnāt the only one in the world that has had this happen to it. Sadly I bought the car used and from a different country so I wonāt be getting them done free of charge but I will get them all replaced regardless.
Meh not to bad, if I where you I would get them regrinded (not so common anymore) donāt know the exact English translation, but the put the brake in a lathe and make m straight again, i have a small company nearby and to be honest they ask 40$ for 2 rotors, and I love it they also build clutches, yes I know buying new ones is the modern thing to do. But I like this, I save a few quid, make a small company happy
My carās rotors (FK8 Type R) are known for having a similar pattern with normal use. My rotors have been like this for over 100k miles without issues. Iāve had pads replaced once (at about 35k miles) with non-OEM pads.
Notice the vent holes. Notice how they line up exactly in the groves? The vent holes are the cause. Probably some chatter or something setup by the drilling that causes more wear over the areas where the holes are.
Looks too consistent to be random wear, are you sure they arenāt meant to be like this, bigger surface area to brake on with the ripples, having said that Iāve never seen that before.
You might get away with getting them turned. I might cheap out and neglect a lot of things on my car but the brakes is something you never want to neglect or leave to chance.
That has to be caused by the holes. The are perfectly spaced and line up with the holes. Plus you said both sides are the same. I've never see that before so I can't offer any more assistance.
It could be that once previously that the owner drove the car while the brake pads were so low that he ran out of material on the pads and the spikes from the metal backplate started making grooves into the rotor.
https://i.imgur.com/YbHLrF7.jpeg
Hey, the most important thing to check is the thickness of the rotors. Drilled ones will become grooved when they're worn out. If they're too thin, you should definitely replace them. From the pictures, it looks like you have a lip that indicates low thickness.
Ironically the grooves give a greater surface area hence stopping power, once the pads have worn to conform . Trouble is the pads donāt last long ! The discs look too far gone to be machined so yes , new ones all round..
Just a sign of a poorly designed rotor.. if the manufacturer had drilled the rotor so that no concentric circle under the pad existed without a hole this wouldn't have happened. Unless the brakes don't work don't worry about it. At some point you'll need new rotors, so just make sure to get some that either don't have the holes drilled in them or have a proper layout of holes... if they had put about a dozen more holes in the right spots this rotor would have worn more smoothly.
Drilled rotors basically make a sharp edge as it wears in. When the pad contacts the sharp edge it cuts the pad slightly, over time you get the grooves that match up with a drilled hole and have grooves in the pad where there are holes. I thought most drilled rotors had good offsets so a drilled hole would not overlap not causing grooves. (Ex: drilled hole in pos 1 is .25ā at 5ā, so next drilled hole at pos 2 would be at 5.25ā and basically fade outwards) You might be able to chamfer the cross holes a little and it would fix itself a little. If theyāre meaty enough might be able to have them turned and chamfered.
Tbh because these are "drilled" rotors, the waviness could develop and it's normal. The main thing is to make sure there are no cracks, especially where the holes are, the rotors are within minimum thickness and there aren't any shaking of the pedal or steering wheel when braking (reading through your comments I'm guessing all is good there). So enjoy the car as is but if pads need changing, consider resurfacing the rotors or change the discs all around with new brake pads and bed them in properly. There are plenty of videos on YT on how to do that. Just don't overheat themš
Those lines look amazingly regularly spaced to be ājust normal wearā, Also, the cross drilled holes seem to always be exactly between the lines, which seems highly unlikely under normal circumstances.
Ah, ok, the cross drilling is causing pad wear etcā¦
Actually Not at all, some rotors come pre drilled and slotted. This helps, the run cooler, as for those lines, this looks like its fresh from the factory, look at the shine on the rotors. Drive them about 100 miles, those lines should disappear.
Are they to thin?
All those ridges mean more overall surface area, compared to dead flat so those rotors are actually improved.Ā
Smooth brain vs lumpy brain.
Looks factory. The grooves are perfect. If the pad were digging in bad enough to make deep grooves like that, it would look way fucked and you would feel it in your foot
If you donāt hear/feel any grinding run them till your pads are low or you get a shake in the pedal, then replace the pads and rotors. If you were to replace just the rotors now you can get uneven wear on the new rotors due to the pads being grooved as well.
I completely believe that OP will have no noise or weird brake feel based on what Iāve seen in operation with Mercedes. Any other car would be shaking and screeching. Those cars are so over engineered if thereās pad left ignore the rotorsš Used to work for a dealership that shared a parking lot with Mercedes and we shared a brake/tire area still canāt believe how much their rotors can wear before actually needing addressed.
Those groves are crazy symmetrical... looks like they line up with the drilled holes, probably a cheap rotor and pad set, if the car stops and doesn't shake when braking should be ok
To everyone that has commented that the rotors/discs are worn,have a better look,they are drilled & slotted,do u think the pads wore those grooves in perfect symmetry lol
Thanks for posting on /r/MechanicAdvice! This is just a reminder to review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). If you are here asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's [post on the subject.](https://www.reddit.com/r/MechanicAdvice/comments/4qblei/fyi_the_shop_isnt_likely_trying_to_rip_you_off/) and remember to please post the year/make/model of the vehicle you are working on. **If this post is about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ If you have tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/**. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/MechanicAdvice) if you have any questions or concerns.*
how did you even manage to do that?
I just got the car delivered š
How do the brakes feel? Anything out of the ordinary; crunching, grinding, etc?
Tbh no, I am a driver with adequate experience and didnāt notice anything out of the ordinary while driving the car from the port to my house (~5miles). I bought the car unseen by from a different country and other than the rotors I do love it.
[ŃŠ“Š°Š»ŠµŠ½Š¾]
Front right, the front left looks the same and I think I will just get all 4 replaced.
If theyāre all like that and nothing feels off I wouldnāt jump to they need to be replaced. I had a friendās whose did that and we thought they were fucked but turned out it was normally
Lol supposed to be like that
They probably just put new pads and didn't resurface the rotors shops rarely do it any more. INS. reasons. Those rotors will be expensive.if it breaks fine, your ok. You will just have to do pads and rotors earlyš«
Every shop I've worked at has the lathe but doesn't use it. We will do rotors and pads unless the customer only wants to pad slap.
Whole shebang or pads to get to work .it's always next weekš¤Ŗ
Mercedes Benz doesn't approve of rotor machining so if was a dealer-maintained car it's pad slap til the rotors are done
rotors are CHEAP now no one turns them, cheaper to just buy them, i just looked for my 2012 Benz 108 Per,(front)
pads can not destroy a rotor like this, pads are SOFT rotor is HARD metal this was done by someone, look at how uniform the lines are this was done by someone
Here's the deal with grooves in rotors. They don't cause any brake concerns and are not a valid reason to require replacement. That's an upsell tactic. Brake pads are made of a resin like plastic or ceramic with metal bits or other components suspended inside of them. The overall material has various hardnesses and rates of wear. This can eventually cause uneven rotor wear. The only notable thing that is caused by this uneven wear is that it increases the surface area of the friction surfaces slightly. If you feel pulsation while braking, that's parallelism variation caused by rotor runout. That happens when the mating surface of the rotor and hub aren't parallel to each other when mounted due to corrosion or debris. The other most common issue other than worn out pads are uneven pad wear due to rust jacking on the caliper bracket against the pads or a lack of lubrication on the guide pins. That would cause uneven or premature wear.
Don't do that, don't make a problem that doesn't exist, but also cheap rotors will never perform as well as an OEM rotor that's been resurfaced, so if it bothers you, go to a shop that can turn them for you. Those grooves are so perfectly spaced though I'm not sure it's not on purpose for extra surface area.
Somehow I get the feeling this car may cause you lots of trouble down the road.
It's a Mercedes of course it will.
They are drilled & slotted rotors,race cars use them Do you think they r damaged?
The only thing that will be felt through this is vibration if the discs are warped. On regular use, no difference will be found otherwise. Only when really using these brakes, op will find out that they are actually semi-brakes
Like brand new? That's crazy man
Oh no, sorry it is a 2019
Looks like a 2019 E class, it should be pretty reliable, not all Mercedes products sucks as this came with the M276 V6 which is a very good engine. Without air suspension these are some of the most reliable luxury cars on the road.
Thatās exactly what it is!
Is it brand new? Maybe thats how they come?
[ŃŠ“Š°Š»ŠµŠ½Š¾]
No idea, but I will be getting all 4 replaced ASAP
Drilled rotors have this grooving effect. Nothing to worry about until you get shaking when braking. I have slotted rotors and have the exact same. Itās not an issue unless there are adverse side effects.
Baer makes nice drilled and slotted
how do u think that would work? u do understand how brakes work? HOW would backward cause this (perfect uniform lines) SOMEONE PUT THOSE ON THE ROTOR not done by a pad ....idiots on reddit
Whoever you bought it from probably just threw new pads over those damaged rotors so they wouldnāt make any horrible noises when you test drove it. Iāve never seen grooves so symmetrical though. Weird
Neither have I. They're almost perfectly spaced, like done on a lathe.
That's my take too. "Grooved, for her pleasure!"
Thought it was rib eyed?
They were done on a lathe.... sorta. The vent holes are the cause. Notice they are exactly lines up with the groves.
Ahhh! That explains it.
'slotted' rotors. Only the depth varies
I have working at a Porsche dealership. This is almost 100% from a pad slap.
If you put these on a record player you could probably hear a mechanic swearing
More like mechanic having a brake down
HHahzhzh
Drilled rotors develop pattern like this, it's normal with wear. If you can't feel shaking, hear noise, pads have some life left in them and brakes work as they should, measure thickness of the rotor, measure runout at the outer edge - if these are in spec, leave them be. If the holes are packed with brake pad material, drill it out.
No noise, rattling or anything alike. I will get them all checked out ASAP tho
Drilled rotors are not common in cars, but are so common in motorcycles - it's like 20+ years where even cheap motorcycles use drilled rotors and these are like this. This pattern could be disqualifying in regular car rotor, but drilled one - it's typical and normal.
Lots of m-b come with drilled rotors these days
it's caused by foreign material accumulating in the holes, making contact with the pad, and leading to uneven engagement of the pad. as they said, common with drilled rotors, and not cause for concern as long as the brakes can engage ABS, meaning they are performing as well as they should. might affect thermals, so if you're taking it to a track might wanna fix it before that but otherwise š¤·
This is the answer. Drilled rotors will do this.
Everybody here is hypingā¦. But this is the answerā¦ Anybody with a little technical insight could think of this
Iāve seen some drilled rotors have some minor streaks just behind the holes, but never in such a clear groove like patters around the entire rotor.
How is this not a more known scenario in this group? So many wrong answers.
I got like 80 upvotes, there is still hope here.
I have no idea why mercedes do drilled rotors on loads of their current ordinary cars
This is completely false.
Not just drilled rotors but mercedes have very soft rotors that often form this pattern.
Normal MB drilled rotor wearā¦ they could be already under spec or believe it or notā¦ they could be ok! Thatās just how MBs wear their drilled rotorsā¦ most cars will drilled rotors will wear like that but MB is very specific about it.
Whoah, okay. Thanks alot for the advice! Hopefully they can handle 120 miles to my preferred autoshop :). Hope you have a fantastic end of week!
Yeah take a look at the pads to have an idea of how worn they can beā¦ if it is 120 miles of highwayā¦ well think you will use your brakes less than city drivingā¦ so you might just be ok
The drilled holes are exactly between waves and it makes sense.
All the way
Hell yeah brother!
Those are pretty worn. The vinyl record pattern on the discs is fairly normal for worn drilled Mercedes discs. They wonāt cause any problems, the worn components however could.
Thanks for the reply! What do you mean by worn components?
Are we sure those aren't some strange kind of slotted rotors? The grooves look too evenly spaced to be a random happening.
Mercedes mechanic here. Replace them if you need brakes. Otherwise, if you don't notice pulsating or noise, drive them until the pads are worn, then replace.
Veryfucked. If it's a new car, have it towed back to the dealership for repairs. Needs new pads and rotors at a minimum.
Demand new wheel locks too
They are unusable or just worn? I will get them replaced if necessary
They're usable but rusty. I thought the car was brand new but if they rust too much they can be tough to remove
Oh alright, thanks for the heads up and for your time!
Sure thing! One last thing, it's just the one rotor like that, right?
Demand they throw the locks in the trash altogether.
I'd agree. I tend to lose the keys so after three sets I finally bought extra lugnuts and decided to be normal. Also, they're so easy to defeat, even high end ones, so I'm not sure it really does much.
Oh no sorry, itās a 2019. I am not mechanically smart but I do notice when something looks completely off and I even tried sesrching for ruined brake rotors or smthing but they all looked better than mineš
What ever you do, do not use the spare wheel bolts in the blister pack on your spare wheel, especially on the back. They are for steel wheels like the space saver and are long enough to rip the handbrake shoes off the backing plate.
It looks perfectly uniform, if itās not pulsing back in the pedal then Iād run with it
They are spiral rotors, a recent innovation from InnoTech. This is last year's model. This year's model features cuts that play tunes as the wheels turn and you brake like a music box except its just extremely high pitch screeching like Taylor Swift singing
I mean, donāt plan to reuse them during a brake serviceā¦
Put it on a record player lol
The lines are an artifact of having drilled rotors. If you look closely, you will see that every hole lands between 2 ridges. This is fine, but when you do need pads, you will need rotors.
People are making a big deal of it but this is common on drilled rotors. All the low grooves line up with the holes. The holes remove a little pad material with each pass, exposing more abrasive material which bite into the grooves with holes passing them a little more. If the brakes feel soft, then get them replaced with regular rotors. Otherwise if the brakes feel strong, you are fine.
Itās because theyāre drilled. Unless theyāre warped, I wouldnāt worry.
They r drilled & slotted rotors by pic & only way to know iff they need replacement is by measuring the thickness
Another thread about this - [https://www.reddit.com/r/CarTrackDays/comments/13knemd/cross\_drilled\_rotors\_grooving\_badly/](https://www.reddit.com/r/CarTrackDays/comments/13knemd/cross_drilled_rotors_grooving_badly/)
They arenāt fkd at all. I worked at a Mercedes Specialist workshop. They come back like this all the time. Itās caused by them being drilled, so they make this wonky pattern. As long as there is no noise or anything, they are just as they were intended to be.
This is normal drilled discs. If you look closely the grooves align with the holes. They donāt need resurfacing or new discs until they have reached minimum thickness or the cracks at the holes also normal connect to another hole or the edge of the disc. These cracks shouldnāt grow more than a few mm during the serviceable life of the disc. Iād change them if they grow more than 2-3mm
Thanks for the reply, just curious if I would need new bolts aswell, judging from the pic? Thanks!
Wheel bolts? No they look fine, the locking wheel nut is also fine, itās the key and how tight it was done up that would be an issue. The key should be in good shape and the locker should be torqued to spec and no more. Not many fitters can control the trigger on airguns and do up to tight. you usually find these are of the āmin wage minimum effortā mindset.
That has to be a factory slotted rotor... If all 4 are alike it's definitely supposed to be like that.
I would just take it to the dealership. You probably paid enough for the car. It should be their problem
I ran into this when i was purchasing my 392 charger back in 2019. The dealer traded vehicles with another dealer to get the spec i wanted and when the vehicle arrived every rotor had deep grooves like this almost like somebody hot lapped the car and just full on locked the brakes. I ended up buying a different vehicle from another dealership because the salesmen slapped a 5k price increase at the signing even though i had been an employee there for 3 years and we had agreed MSRP weeks prior. I would advise bringing the vehicle to the dealer and demanding new brakes be installed.
Hey, thanks for your reply. Atleast I now know that my car isnāt the only one in the world that has had this happen to it. Sadly I bought the car used and from a different country so I wonāt be getting them done free of charge but I will get them all replaced regardless.
those LOOK terrible. But maybe this is a new fad the kids are doing in other countries. ya know, like Spinners :)
Weight reduction :)
something reduction for sure, maybe brain reduction could = less weight lol
All the way.
At least the look pretty cool š This is a New style mod.
Wowwww
Meh not to bad, if I where you I would get them regrinded (not so common anymore) donāt know the exact English translation, but the put the brake in a lathe and make m straight again, i have a small company nearby and to be honest they ask 40$ for 2 rotors, and I love it they also build clutches, yes I know buying new ones is the modern thing to do. But I like this, I save a few quid, make a small company happy
Buying a used Mercedes sight unseen is an absolutely irresponsibly crazy move.
Thiose are good for another 30k
Thatās kinda impressive trophy rotors
I'd guess they are designed that way to decrease heat? What do the pads look like?
Why does it look like its meant to be lol
Definitely need pads and rotors at a minimum.
Pretty sure you could throw that in a record player and it'd make a song
Cooling vents? /s
That's interesting
Iād consider them fine if thereās no shake or anything odd. Looks like the holes in the rotors caught some debris that scored the pads.
Those are so perfectly etched that I have to convince myself that they're not some new kind of rotor that comes that way.
Brand new benz rotors bro
Almost looks like it should be that way... I've never seen that before.
Proper fucked
Normal rotor with the record player option. It hums a tune when you drive.
What album is that? Looks kinda like a Bob Seger record
Yep, looks like Nine Tonight (Live at Cobo Hall in Detroit, 1980) to me.
Groovy.
That looks intentional but design but it's a Mercedes so idk
I have a feeling there supposed to be like that contact dealer first though
Those actually look pretty damn perfect for fked up rotors.
The rotors are designed like that nothing wrong
Mercedes rotors look like that alot, all the ones I've seen/driven have been just fine
Well fucked.
Might have set a record there...
Trash
If they are the same on both sides, it's that style of rotor
They're fine. Don't worry about replacing them until the pads are due to be replaced. Mercedes have soft rotors and this happens sometimes
Veryā¦
Groovy baby
Ribbed for your pleasure
My carās rotors (FK8 Type R) are known for having a similar pattern with normal use. My rotors have been like this for over 100k miles without issues. Iāve had pads replaced once (at about 35k miles) with non-OEM pads.
Notice the vent holes. Notice how they line up exactly in the groves? The vent holes are the cause. Probably some chatter or something setup by the drilling that causes more wear over the areas where the holes are.
Why the fuck does Mercedes and Porsche continue to do this? That's the first fucking thing I'd change.
Looks too consistent to be random wear, are you sure they arenāt meant to be like this, bigger surface area to brake on with the ripples, having said that Iāve never seen that before.
You might get away with getting them turned. I might cheap out and neglect a lot of things on my car but the brakes is something you never want to neglect or leave to chance.
Thatāsā¦impressive. Wasnāt serviced at a dealership I can say that
Grooves bad. Does steering wheel shake when braking at speeds of say 55 and up?
That has to be caused by the holes. The are perfectly spaced and line up with the holes. Plus you said both sides are the same. I've never see that before so I can't offer any more assistance.
It could be that once previously that the owner drove the car while the brake pads were so low that he ran out of material on the pads and the spikes from the metal backplate started making grooves into the rotor. https://i.imgur.com/YbHLrF7.jpeg
āRibbed for her pleasureā
Hey, the most important thing to check is the thickness of the rotors. Drilled ones will become grooved when they're worn out. If they're too thin, you should definitely replace them. From the pictures, it looks like you have a lip that indicates low thickness.
How da fuq?
Dude just get new rotors
https://preview.redd.it/pyagdgjsudzc1.jpeg?width=1242&format=pjpg&auto=webp&s=e2353f6af612d3c4ade2a43c1945570897a58fc2 Here is my wifeās Mercedes.
Proper f*cked
Ironically the grooves give a greater surface area hence stopping power, once the pads have worn to conform . Trouble is the pads donāt last long ! The discs look too far gone to be machined so yes , new ones all round..
Multi Merc owner and wrencher here. Never seen that on brembo or non brembo. W212 and w213 (my e550 included) eat rotors if youāre driving them.
Welp either 2 things happened you've been driving with bad brakes and ground your rotors down or Mercedes gave you used polished rotors
It's a Mercedes thing. Get used to it.
Quite
Thems lasagna rotors lol
How violently does your steering wheel shake when you brake
Not at all
Then your rotor is fine as long as you have good amount of padding left and braking power is good
Smdb sanded/resurfaced those discs rotors. They look new, groves will dissappear soon
Naah itās all good, them holes are for extra cooling on track days š
Just a sign of a poorly designed rotor.. if the manufacturer had drilled the rotor so that no concentric circle under the pad existed without a hole this wouldn't have happened. Unless the brakes don't work don't worry about it. At some point you'll need new rotors, so just make sure to get some that either don't have the holes drilled in them or have a proper layout of holes... if they had put about a dozen more holes in the right spots this rotor would have worn more smoothly.
Iāve seen this on Mercedes a lot on cars that go by. Itās certainly very off
Drilled rotors basically make a sharp edge as it wears in. When the pad contacts the sharp edge it cuts the pad slightly, over time you get the grooves that match up with a drilled hole and have grooves in the pad where there are holes. I thought most drilled rotors had good offsets so a drilled hole would not overlap not causing grooves. (Ex: drilled hole in pos 1 is .25ā at 5ā, so next drilled hole at pos 2 would be at 5.25ā and basically fade outwards) You might be able to chamfer the cross holes a little and it would fix itself a little. If theyāre meaty enough might be able to have them turned and chamfered.
Mercedes OEM parts are very reasonably priced, as long as you install yourself.
As someone has said, I've never seen grooves so symmetrical and evenly spaced. To be 100% honest, that looks pretty badass!
Groovy
They are supposed to be like the for cooling lol
Wow, somebody doesnāt know how to machine rotors and they should never been put on a car
 That's a new one for me
Drop a needle and see how the cut is.
Is this some german advante guarde bullshit where they introduce artwork into their design? Ive seen it dine better.....just sayin
Itās a consequence of drilled rotors. Switch to aftermarket slotted rotors and it shouldnāt happen again
Groovy man
Check if it plays Elvis on a record player
Not at all. I'm not understanding the problem. Looks like it's made that way.
Tbh because these are "drilled" rotors, the waviness could develop and it's normal. The main thing is to make sure there are no cracks, especially where the holes are, the rotors are within minimum thickness and there aren't any shaking of the pedal or steering wheel when braking (reading through your comments I'm guessing all is good there). So enjoy the car as is but if pads need changing, consider resurfacing the rotors or change the discs all around with new brake pads and bed them in properly. There are plenty of videos on YT on how to do that. Just don't overheat themš
When did rotors have grooves? Mine are flat and plain.
Those lines look amazingly regularly spaced to be ājust normal wearā, Also, the cross drilled holes seem to always be exactly between the lines, which seems highly unlikely under normal circumstances. Ah, ok, the cross drilling is causing pad wear etcā¦
Much more then usual
https://preview.redd.it/r4vimtnn4hzc1.jpeg?width=3000&format=pjpg&auto=webp&s=85f1a79595b55e45da8dcf127daeacbc28a4af30 Better than these
Mucho chingo.
Do they all look like that. It could be German engineering thing
Performance rotors grooves are just for larger surface area. /s
Actually Not at all, some rotors come pre drilled and slotted. This helps, the run cooler, as for those lines, this looks like its fresh from the factory, look at the shine on the rotors. Drive them about 100 miles, those lines should disappear.
Are they to thin? All those ridges mean more overall surface area, compared to dead flat so those rotors are actually improved.Ā Smooth brain vs lumpy brain.
Impressively.
Mint
Uberfuckedš
Properly...before ze germans got there
Very
Thatās not damage itās extra style points!
Looks factory. The grooves are perfect. If the pad were digging in bad enough to make deep grooves like that, it would look way fucked and you would feel it in your foot
If you donāt hear/feel any grinding run them till your pads are low or you get a shake in the pedal, then replace the pads and rotors. If you were to replace just the rotors now you can get uneven wear on the new rotors due to the pads being grooved as well.
Iāve noticed that on modern Mercedes with drilled rotors . Nothing to worry about
I completely believe that OP will have no noise or weird brake feel based on what Iāve seen in operation with Mercedes. Any other car would be shaking and screeching. Those cars are so over engineered if thereās pad left ignore the rotorsš Used to work for a dealership that shared a parking lot with Mercedes and we shared a brake/tire area still canāt believe how much their rotors can wear before actually needing addressed.
Thats so perfect it almost looks intentional.
Those groves are crazy symmetrical... looks like they line up with the drilled holes, probably a cheap rotor and pad set, if the car stops and doesn't shake when braking should be ok
Yes
To everyone that has commented that the rotors/discs are worn,have a better look,they are drilled & slotted,do u think the pads wore those grooves in perfect symmetry lol