Brake Disc Run-Out Check And Correction

Check for wheel bearing looseness in the axial direction. Refer to WHEEL BEARING END PLAY CHECK for front, or WHEEL BEARING END PLAY CHECK for rear.
If the axial play is within the limit value, secure the brake disc by tightening the nut (M121.5) evenly to the specified torque [100 N.m (74 ft-lb)]. If the axial play still exceeds the limit value, replace the wheel bearing. Then secure the brake disc by tightening the nut (M121.5) evenly to the specified torque [100 N.m (74 ft-lb)].
Place a dial gauge ca. 5 mm (0.2 inch) inward from the circumference of the brake disc to measure its run-out.
Limit:

<Front brake disc>: 0.10 mm (0.0039 inch)

<Rear brake disc>: 0.04 mm (0.0016 inch)

Fig 1: Measuring Run-Out Of Disc
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
If the brake disc run-out exceeds the limit value, re-phase the brake disc to the hub so that the minimum brake disc run-out is obtained.
CAUTION:
- Insert M12 plain washer and then install the adapter as shown in illustration before grinding. Failure to use the M12 plain washer will cause the brake disc to be deformed and ground incorrectly.
- To grind the brake disc, ensure that all the nuts (M12 X 1.5) are tightened evenly and in a diagonal sequence to the specified torque [100 N.m (74 ft-lb)]. Failure to use all the nuts (M121.5), excessive or uneven tightening torque will cause the brake disc to deform or shudder.
If the brake disc run-out exceeds the limit value after re-phasing, grind the disc while in place on the vehicle so that the brake disc run-out is within the limit value