To so many that were having the Grinding noise when breaking. I did a copy of a few these issues that were repeated many times in this forum and put it in an email to the Manager at the dealership I bought our Buick at. I asked them what GM was going to do about this? I got an immediate response that GM would replace the front brakes to bring it in, which we did. Bingo it took care of the problem. So those that are experiencing that grinding sound of metal against metal, it probably is the same problem we had it once the front brakes were replaced under warranty the problem was solved.