Front Brake Rotor: Inspection
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 1999 Pontiac Montana, 1999 Oldsmobile Silhouette, 1999 Oldsmobile Bravada, 1999 GMC Yukon, and 1999 GMC Suburban. 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).