Lateral Runout (LRO) - Front

^ Tools Required
- J 8001 Dial Indicator Set

1. Remove the tire and the wheel. Refer to Tire and Wheel Removal and Installation in Wheels, Tires and Alignment
2. Tighten the wheel nuts so that the rotor is tight against the hub (JC1 system only).
3. Adjust the wheel bearings in order to eliminate excessive free play (RWD pickups only). Refer to Wheel Bearing Adjustment in Steering and Suspension.
4. Clean the rotor surface.





5. Install the J 8001 so that the dial indicator button contacts the rotor surface about 25 mm (1.0 inch) from the outer edge.
6. Set the dial indicator to zero.
7. Turn the rotor one complete revolution and observe the lateral runout on the dial indicator. The Total Indicator Runout (TIR) should not exceed 0.08 mm (0.003 inch).
8. If lateral runout is not within specifications refinish or replace the rotor (RWD pickups only).
9. In some cases, excessive lateral runout can be rectified by indexing the rotor. Move the rotor one or two wheel bolt positions from the original position (JC1 system only).
10. If the lateral runout still exceeds 0.08 mm (0.003 inch), check the hub for excessive lateral runout, or looseness (JC1 system only).
10.1. Remove the brake rotor. Refer to Brake Rotor Replacement - Front.
10.2. Reposition the J 8001 so that the button contacts the surface of the hub.
10.3. Set the dial indicator to zero.
10.4. Rotate the hub one complete revolution.
10.5. Note the lateral runout.
10.6. If the hub lateral runout exceeds, replace the hub. Refer to Wheel Hub, Bearing, and Seal Replacement (RWD Pickup) or Wheel Hub, Bearing, and Seal Replacement (4WD Pickup and Utilities) in Steering and Suspension.
10.7. If the hub lateral runout is within specifications, refinish or replace the rotor. Refer to Brake Rotor Refinishing.