My 01 Malibu went through a couple of sets of pads and rotors in 40k miles. The pedal would start to pulsate after about 10k miles. I have had Semi-Metalic pads on now for 15k+ miles with no problems at all. The stock Ceramic pads were the culprit, they look good on paper but hold to much heat for day to day driving. The Semi-Metalics on stock rotors are the way to go.