TL*THE CONTACT OWNS A 2007 GMC SIERRA 2500. ON TWO SEPARATE OCCASIONS WHILE DRIVING DOWNHILL AT 45 MPH, THE ROTORS BECAME WARPED AND BEGAN SMOKING. THE CONTACT SMELLED A BURNING ODOR. ON EACH OCCASION, THE DEALER COULD NOT FIND ANY FAILURES. THE CONTACT WAS CONCERNED THAT HIS BRAKES WOULD FAIL WHILE DRIVING DOWN A HILL. THE CURRENT MILEAGE WAS 24,000 AND FAILURE MILEAGE WAS 22,000.