Lateral Runout Check

The best way to check lateral runout is with the wheels still installed on the vehicle. This gives a much more accurate reading of the Total Indicated Runout (TIR) under real braking conditions. If equipment is not available to perform the check with the wheels installed, the next best reading can be made with the wheels removed but the caliper still installed.

Remove or Disconnect
1. Raise vehicle and suitably support.
2. Mark relationship of wheel to hub.
3. Tire and wheel.
4. Clean rotor surface.
5. Reinstall the wheel nuts to retain the rotor.
6. Fasten a dial indicator to the steering knuckle so that the indicator button contacts the rotor surface about 0.013 mm (.0005 inch) from the outer edge.
7. Set dial indicator to zero.
8. Turn the wheel one complete revolution and observe the runout indicated on the dial. The TIR must not exceed 0.080 mm (0.003 inch).
9. If lateral runout exceeds the amount specified in step 6, refinish or replace the rotor.

In some cases, excessive lateral runout of the rotor can 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, check the hub for excessive lateral runout or looseness. If the hub lateral runout exceed 0.040 mm (.0015 inch) then replace the hub. If lateral runout is within specifications, then refinish or replace the rotor as necessary.

CAUTION: Whenever the rotor has been separated from the wheel bearing flange, clean any rust or contaminants from the wheel flange and brake rotor mating surfaces. Failure to do this may result in increased lateral runout of the rotor, and brake pulsation.

Install or Connect
1. Remove wheel nuts securing rotor to hub.
2. Tires and wheels.
- Align previous marks on wheel and hub.
3. Lower vehicle.