PeachParts Mercedes-Benz Forum - C230 - Unusual brake problem

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Rotors do fail invisibly

Quote:

Originally Posted by DonB

OK, I got the parts from *************** and did the rear brakes:

ATE N1040-110890 Brake Caliper 81.25
ATE N1040-110891 Brake Caliper 79.85
FTE N7000-98698 Brake Hose 20.14
CFW N7000-98698 Brake Hose 25.75
BAL N1000-54215 (2) - Brake Disc 66.72
PBR N1010-113300 Brake Pad Set Deluxe 45.19

The pulsation was significantly improved, but I still get a nasty pulsation when I hit the brakes at freeway speeds and some in normal around town driving, mostly from the front. I'm going to get the front rotors turned today, but I don't know if that will help. Anyone have any other suggestion? Thanks,

Don

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Hi Don,

A problem can occur with rotors that does not even show up when they are cold..
The two layers are separated by a series of internal fins (web) which can crack internally due to repeated hard braking which causes heating and cooling.. This cause the braking surfaces
to have bulging separated by thin spots. Often it is only one side that fails in this way..

You could try a new rotor on the side to which the car DOES pull to save money, but the other one might also cause trouble later. it could also be twice the labour to move the new rotor
while trying to figure out which is the bad side.

Good luck..
Ron

Thanks Ron, if turning doesn't fix the problem, I'll consider that next, but wow, these rotors are pretty new. Maybe a different brand next time. I did get the rotors turned this afternoon. The shop said they had some warping, so maybe that's the answer. The picture is before getting it turned. I don't know what the gray spots are about, but maybe those were hot spots?

Don

Quote:

Originally Posted by DonB

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Hi Don,

I would think that any differences in the surgace after turning, would more than likely be due to
hardness differences which were the result of hot spots..

I am surprised at the amount of rust showing if there are not very old rotors..:vanish:
Have you looked into the availability of a more rust resistant type of metal?
For some reason, some of the Toyota/Lexus products seem to have rotors which do not show
rust after a couple of years use. Maybe a little nickel in the mix was all it took?

Stainless steel would be expensive , but it they did not crack or warp, it might be worth the cost in the long run. If open wheels were on the car, it would shore'nuff look purrty. ::gorgeous:

Good luck with the latest remedy.

Ron

Well, I got the front rotors turned. The tech at the shop said they were definitely warped. They took over a week for the pads to seat completely, but my problem seems to be solved. No more pulsation at all. Thanks again to everyone that helped me on this, I really appreciate it.

Don