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Old 09-30-2001, 02:42 AM
Registered User
Join Date: May 2001
Posts: 301
warped rotor?

What are the signs/road feel of a warped rotor?
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Old 09-30-2001, 06:58 AM
HaYN Benz
Posts: n/a
Warped rotors are felt as a (usually) noiseless rhythmic pulsation, sometimes vibrating the entire vehicle. It is especially apparent when when braking at about 50% pressure - i.e., on a long incline.

Hard braking sometimes masks warped rotors since the pulsation is caused because the brake pads grab the higher spots (peaks) and not the lower spots (valleys). Under full braking, the pressure on the pads is so great the pads "ride" the peaks and the valleys and the brakes feel ok.

If you only feel the pulsation in emergency braking and there is an audible very-fast-pulsating-sound as you come to a stop, that is probably your ABS - working properly. The vibration is also limited to just the brake pedal.

Of course, if you hear a grinding or growling sound when coming to a stop, you might also have worn pads altogether. This is not good news as your rotors might need to be resurfaced or replaced. The good news is that total brake pad wear is rare since MBs have a brake pad indicator light on the dash, as you know.

Hope this helps.
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Old 09-30-2001, 12:51 PM
Registered User
Join Date: May 2001
Posts: 301
I am not feeling a
vibration or a pulse exactly, it is more of a slow forward rocking feel.
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Old 09-30-2001, 05:44 PM
Posts: n/a
The most common symptom is felt when slowing to a stop. The vehicle lopes to a stop as you almost come to a rest, sort of pulsing as the rotor warpage hits the pads and then releasing as the wheel continues to make a 360 degree rotation. Or as we might say in the south, "It sas-shays" to a stop.

If you have this condition and wish to fix, you may find that the caliper bracket is not allowing the caliper housing to move freely and therefore will not release completely clear and allowing the pad to generate a whole-lotta heat as you go down the highway thus warping the rotor. Simply replace mounting bracket as well as rotor. Also, if the rotor gets really hot, it is bad to clamp down on the brake for an extended period of time.
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