Front Brake Rotor: Inspection
WARNING: This page does not describe the selected car, but rather 46 other vehicles, including the 2001 Pontiac Montana, 2001 Pontiac Aztek, 2001 Oldsmobile Silhouette, 2001 Oldsmobile Bravada, and 2001 GMC Sonoma. However, it is still accessible from the selected car via links, so may be relevant.
Inspect rotor lateral runout and parallelism. See DISC BRAKE SPECIFICATIONS . If lateral runout cannot be corrected check hub bearing for excessive lateral runout or looseness. Hub bearing assembly lateral runout cannot exceed .0016" (.040 mm).