Stereo5, it was not warped rotors it was bad metal. GM used crappy metal for their rotors for years. When your rotors and pads get wet during a rain or snow event water stays under the pads when you stop and corrodes the metal under the pad. With good metal the corrosion does not go that deep and the disc gets cleaned off after a few stops but with the garbage GM was using the rotors would start pulsing as if they were warped but even good rotors will to this if the car is left outside, inactive for long periods at a time or washed frequently, immediately put away and left inactive. I has a GM pick up truck back in 2001 and the rotors were trash after only 10,000 miles I asked the tech how this could be and his response was that "they all do this." I have forever sworn off GM products. They should have been allowed to go bankrupt.
