My brakes are squealing when I lightly apply the brakes. It's more apparent when I'm at a slow speed and just about to stop. Heavy pressure on the pedal makes the squeal go away. When I bought the Envoy a month or so ago the dealer said the rotors and pads were all replaced (look brand new). I pulled the pads off and lubed the slides and noticed they are semi metallic. I'm thinking about just putting ceramic ACD pads on it and keeping these same rotors. Any thoughts on whether this will get rid of the squeal or cause any issues since I'm not also replacing the rotors?