There is a service bulletin from Chevy about the rear brake problem, have
the dealer look it up, and then contact your Zone manager.
Had mine looked at by Chevy for the front brakes squealing, but they found
nothing wrong with them.
Showed me the bulletin about rear brakes though, and it shows a new mud flap
assembly that gets installed on brake caliper. Pretty neat idea, but
usually only for the off-roaders, according to dealer.
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