Originally Posted by huyatgr
Just a quick question regarding our 2010 335d: at 23,000 miles, we noticed a slight shimmy when braking and when our dealship checked it out for us, he determined the front brake rotors were warped. Replacing today under warranty, but what would cause this condition with so few miles on the car---and no hard driving at all! Thanks for any input from you guys.
With such low mileage, I suspect that if you had rebed the pads, the shimmy would have gone away. I have that problem once in awhile on both my E46 330ci and my B6 S4. Next time this happens, and it will, find a stretch of open road, get up to 60 and brake at light effort down to about 10, back up to 60 and brake increasing to about half effort down to 10, back up to 60 again and brake at three quarters effort down to 10. Repeat the harder braking 4 or 5 more times do not come to a full stop at any time in the cycle.
Drive normally for 3 or 4 minutes then park the car for 20 minutes or so without hand brake engaged to allow the pads to cool.
I find that moderate driving with some degree of traffic stop start can make your brakes need rebedding every 10-15K.
I used to go nuts with rotors till I discovered this trick. It is not just for new pads, it seems that light braking in traffic can remove the built up friction material from the rotor and rebedding reestablishes a layer of material needed for smooth braking.