Lateral Runout
WARNING: This page is about a different car, the 1991 Oldsmobile Toronado, 1991 Cadillac Seville, 1991 Cadillac Eldorado, 1991 Buick Riviera, and 1991 Buick Reatta. However, it is still accessible from the selected car via links, so may be relevant.
Raise and support vehicle. Mark relationship of wheel to hub and remove wheel. Reinstall 2 lug nuts to retain rotor to hub. Clamp a dial indicator to caliper so it contacts rotor at a point about 1/2 inch from outer edge. Turn rotor one full revolution. Check indicator reading. If reading exceeds specification, refinish or replace rotor.