Monte Carlo V6-3.8L VIN K (1998)
Brake Rotor/Disc: Testing and Inspection
Brake Rotor Lateral Runout Check
NOTICE: Whenever the brake rotor has been separated from the wheel bearing flange, clean any rust or foreign material from the mating surface of the
rotor and flange. Failure to do this may result in increased lateral runout of the rotor and brake pulsation.
Inspect the lateral runout with the wheels on the vehicle in order to get a more accurate reading of the Total Indicated Runout (TIR) under real braking
conditions. If the equipment is not available to perform the check with the wheels on the vehicle, remove the wheels with the caliper in place in order to
get an accurate reading.
IMPORTANT: If the wheel must be removed, reinstall the wheel nuts in order to retain the rotor. Tighten the wheel nuts to the correct torque
specifications.
1. Clean the rotor surface.
2. Fasten a dial indicator to the steering knuckle so that the indicator button contacts the rotor surface about 13 mm (0.500 inch) from the outer edge.
3. Set the dial indicator to zero.
4. Turn the wheel one complete revolution. Inspect the runout indicated on the dial. If the Total Indicated Runout (TIR) exceeds 0.080 mm (0.003
inch), refinish or replace the rotor.
In some cases, excessive lateral runout of the rotor may be improved by indexing the rotor on the hub, one or two bolt positions from the original
position. If the lateral runout cannot be corrected by indexing the rotor, inspect the hub and bearing for excessive lateral runout or looseness. If the hub
lateral runout exceeds 0.040 mm (0.015 inch), replace the hub. If lateral runout is within specifications, refinish or replace the rotor as necessary.
