seem to have a problem wiith the brakes on my S3. the brakes seem to be juddering badly when braking. The problem has occured before so i changed the discs for drilled zimmerman discs with standard audi pads which solved the problem for a while but the problem has come back. I'm guessing the new dics are warped as they were before. Anyone any idea what can be causing this to happen, i don't thiink i'm particularly heavy on the brakes. What is the main cause of warped discs, heavy braking then cooling too quickly??
any advice appreciated