Squeeky rear brakes on 2007 new style silverado
 

Does anyone else have this problem with noisy rear brakes? The dealership say they can't do any thing about it and that it is normal. They can get pretty loud some times. I have taken it to two different dealer shops, both say the same. What should I do?

Also, why did GM go back to rear drum brakes from previous rear disk brakes?

Thanks for your thoughts!