The brakes on the car are screeching. I have taken it into the dealer and they said nothing wrong. However tech said they did some sanding/filing on the brakes. Its been about a month since I took the car in and the brakes are still screeching. Any suggestions?

 

probably some sand or something got embedded into the brake pads causing the sound. They sanded the pads trying to get rid of it. If it is real bad, changing the pads will get rid of the screeching.