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Re: Rear brake problems, now warped rotor

-----Original Message-----
From: Craig D. Niederst <niederst@telerama.com>
To: quattro@coimbra.ans.net <quattro@coimbra.ans.net>
Date: Wednesday, May 13, 1998 7:15 PM
Subject: Rear brake problems, now warped rotor

>I appreciate all the posts that I received addressing my problem. I took my
>car back to the shop to have them look at the rear wheels/brakes to find
>problem. The pads were fine, and the rotors looked ok. The said the
>were not seized or sticking either. They lubed all the applicable movable
>parts in the calipers, and the noise is still there. Their best guess
>without a closer look ($$$) is a warped rotor. But the car does not shimmy
>or pulse when the brakes are used. Is it possible for a rotor to warp just
>because the car sits in one place for 2 weeks? BTW, who has the best price
>on rotors/pads? TIA.
>'92 100S (71k)

Hi Craig;

    I have noticed similar symptoms if my car sits for a couple of weeks
outside, particularily if the weather is wet. The brake pads rust to the
rotors; in fact you can feel them break free when you first move the car.
The brakes thump on application each time the rusted area (nicely shaped
like a brake pad) passes under the pads. This cleans up in use quickly on
the front rotors but takes longer on the rears due to the lower braking
effort. I have found that if the rear rotors get badly rusted they never
clean up and will continue to rust. With our liberal use of road salt up
here in the GWN, I go through a set of rear rotors every year.
    If this is the problem with your car, the rusted areas should be visible
on your rotors.


Fred Munro
'91 200q  251k k