Brau0318

I have a slight shake when braking that feels like my back rotors are warpped. I just had the front brakes done about a month ago and when they inspected them the said the rears have a 7mm thickness. I'm wondering if it's possible they are warpped even though they are that thick. Could it be the pads. Can they machine them slightly? They also recommened doing a brake fluid flush. Why would they not have done that when they did the front brakes?

Brau0318

Nobody huh, hard to believe!

raymond g-

you're posting a question on a weekend and expect something in 8 hrs? you
could have used that time to google the specs for your car in minutes.

the 7mm quote you have appears very thin. naturally, we'll not be able to tell
you one way or the other whether they're warped or not. you should seek a
runout check. minimum spec is stamped on the rotor/hub

i'm curious what prompts you to suspect the rear rotors when you feel pulsating
....say, instead of the front.

Kayos77

When you say 7mm, are you meaning pad thickness or rotor thickness?? If your rotors are at 7mm, it's time to replace them. If its the pads, do like Raymond said and have the runout checked and if it's within specs, have them resurfaced. Is the pulsation you feel in the steering wheel or throughout the whole car?

Brau0318

It just feels exactly like the rear rotors are warped. Once they ingauge, the car kinda jerks forward then stops smooth and repeat, ever so slightly, and quickly. Gives the overall feeling of a shake but if you feel closely it's not. Other people who drive my car cant feel it. But it's my car so I know somethings wrong. I'm asking because it's for sale and I dont want to be throwing money at it, if I dont have too. Seeing as how the front brakes and rotors where replaced feb1 and as of 4 days ago, merecedes inspection reported 10mm front and 7mm rear. All it says on the new write ups is (brake lining)then measurement

Kayos77

I'd get the rear rotors resurfaced then.

ohlord

mercedes rotors when they get scored,worn to serviceable limit you replace them.

Kayos77

He said he wanted to sell the car. Why spend money on rotors just to sell it?? Resurface them and be done with it

RobertG

When you resurface the rotors it will lead to warping(thinner).
Just tell the buyer what the inspection says and it will be better then cutting the rotors and causing a failure.

Brau0318

Do you know if its possible to just shave a mm off. Only one. I'm guessing it's the difference between feeling the brakes and not feeling them. I can hardly notice sometimes, I know someone who has never driven a Mercedes wont. In the 230 you still could but not the 210, too smooth. First time I took off down the freeway in a 210, in my head I was like sold!!

RobertG

It is possible ,I would not do it.

Brau0318

Yes, but is serviceable limit near 7mm. I've owned the car for 2.5 years and have never touched the brakes until this year. I got the front brakes and rotors replaced feb.1. They said only the front needs to be done. Then I get a report feb.28th from inspection saying that the front "brake lining" measures 10mm while the rears measure 7. Rotors and pads both front and rear are factory. What does a new rotor measure? Something smells or are they reffering to the pads? Also is it possible a warped rotor passed an inspection?

ohlord

pad serviceable thickness. Your rotor could not possibly be 7mm that is a bit more than a 1/3 of an inch.
Mb rotors are usually around 25.4 with minimum service life at just a few mm below that(stamped on edge or rotor) With just a few mm from being fine to being below service life you can understand why Mb recommends replacement at brake service there is not enough material to remove on a lathe. Most machine shops when looking at the max min specs would not turn them anyway.
If the brake shudder showed up after the front brakes were replaced
have them check proper rim lug torque and that the new pads were properly bedded in.

raymond g-

zactly my thoughts, ohlord. minimum critical limits should be double digits on the
rotors so i'm skeptical that any shop would allow or recommend the rotor to
be in single digit and not raise a red flag

Hirnbeiss

The rear discs are thinner. On mine, they are 10mm new with an 8.3mm wear limit. Some have 22mm, but I think they're all AMGs.

ohlord

non vented rear rotors are thinner but no 7mm thin. His printout reads brake linings ...that is pad thickness left. 7mm is going to set off the one rear wear sensor. Why they did not replace them when they did the fronts is up for speculation.
Go to a different shop and have the brakes and rotors inspected. It will pay off when you do try to sell it.