Brake Disc Pads problems of the 2005 Chevrolet C/k 2500

: the contact stated the vehicle had been to the dealership on 5 occasions for brake repairs. The vehicle vibrated and pulsated when the brake pedal was depressed and the front end of the vehicle shook. The first time, the rotors were cut and the pads were shaved. The second time, the rotors were cut and the pads were replaced. The third time, the rotors were cut and the pads were shaved. The fourth time on 8-15-06, the rotors were cut and the pads were either shaved or replaced. On 8-19-06, the vehicle vibrated again and the brake pedal pulsated when depressed. The contact took the vehicle back on 8-25-06. The dealership test drove the vehicle, but did not inspect the brakes and could not duplicate the problem. Upon inspecting the rotors, the contact noticed grooves in the rotors within 500 miles of the last time the rotors were cut.