I have constantly had to replace my back brakes and rotors due to a insufficient aluminum disc that gmc installed i have receipts to prove how many back brakes in rotors i have had to replace. thank god i was on the left side of the highway my six children and i almost lost are life the brakes went out we had to veer off into the terrain just to come to a stop in the mean time my tire popped from all the excitement and me and my kids was stuck on a major highway for 6 hours before we was towed in brought to safety. i am asking for this disc problem be repaired immediately for my family safety. *tr