Have your mechanic recheck his work. Your description sounds like there could be a combination of things, especially if it just started with the brake job. First, the front rotors should be checked for "lateral runout" on the car with a dial indicator. If it is more than a few thousandths of an inch, he accidentally machined a warp into them, which is easy to do, the new rotors are slightly warped, which is not uncommon, or some rust or other debris got stuck between the rotor and hub and is making the rotor and wheel wobble. Any of those things have to be relatively bad to be felt in the brake pedal or steering wheel. When that warpage is minor, it will still cause the brake caliper to walk back and forth sideways a little. Calipers are supposed to be able to do that but that sliding can set up a chirping sound. High-temperature brake grease is used on the caliper mounts or attaching bolts to allow free movement, but once that grease wears off, the noise will start up.
Even the most conscientious mechanics often miss one thing when they apply that special grease; that's the anti-rattle clips on the brake pads. They can also cause a chirping sound on some cars. The clue is that the sound stops when you apply pressure on the brake pedal.
Wednesday, August 10th, 2011 AT 8:58 AM