Two problems related to brake disc have been reported for the 2001 GMC Sierra. The most recently reported issues are listed below.
Vehicle is parked for extended period of time (2+ weeks) and the machined surface on the rear rotors rusts and peals off leaving a rough surface wearing out pads prematurely and necessitating the replacement of the rotors.
Brake problem w/2001 GMC Sierra. Four wheel disc brakes. Rotors were complelely rusted at 60k miles. Severe loss of brake power although pads were not ignificantly worn. This caused replacement of 4 rotors. Gm mechanic said this is common problem.