I have a brake squeal that is becoming a growing problem. It started at as a slight squeak here and there, then you could hear more metal and metal contact. I had to dealership take a look at it, and they said that there was a lot of brake dust in the wheels, and so they put the brakes through a "burn" process where they made a few aggressive stops from 40 mph to 0 mph. They said that this would clean out the brake dust. However, lately my car has been squealing a lot more often. The squeal is louder, and occurs not only when I come to a complete stop, but also when I hit the brakes at other speeds, i.e. 40 mph, 60 mph. I also hear a louder metal to metal contact; It is a rough sound. I am not sure what I should do about this? The dealership said that there is 50% life on the brake pads. Is there somthing wrong with the rotors? Any suggestions and advice is greatly appreciated. Thanks in advance.