PeachParts Mercedes-Benz Forum - View Single Post

whunter · #6 08-16-2004, 09:22 PM

Quote:

Originally Posted by Ferdman

Ethan, the marks are radial ... form the center outward. All components are tight and the lug bolts are, and have been, torqued properly with a torque wrench since the car was new.

whunter, the fact that the car is 7 years old does not mean that the rotors should be warped. Our 1991 (131,000 miles) and 1992 (89,000 miles) 300CE's still have the original unwarped rear rotors.

True:
A seven year old rotor that has been stored in a box, with the correct protective oil coating should be perfect.

However:
A seven year old rotor that has been driven through weather conditions, and shows radial stress marks should at the least be checked for run out.
The odds are that it is either warped or corrosion has built up between the hub and rotor, thus taking it out of true.

This is natural and normal in aged cars, no reflection on the owner.

I do not resurface the rotors on my personal cars; the cost of new rotors is so low that it is not worth my time.

As to the 1991 (131,000 miles), I would never run a set of rotors that many miles, OEM durability testing and structural build design limits are 100,000 miles.
The stresses build up in the metal and you court disaster by exceeding the design and engineering limits of the structural material.
This is a safety issue, yours and other peoples; a new set of rotors is cheap insurance for your life.