Brake Disc Run-Out Check and Correction

BRAKE DISC RUN-OUT CHECK AND CORRECTION
1. Remove the brake assembly, and then hold it with wire.
2. Temporarily install the disc with the hub nut.





3. Place a dial gauge approximately 5 mm (0.2 inch) from the outer circumference of the brake disc, and measure the run-out of the disc.
Limit:
[Front brake disc]: 0.10 mm (0.0039 inch)
[Rear brake disc]: 0.04 mm (0.0016 inch)





4. If the brake disc run-out exceeds the limit, correct it as follows:
1) Chalk phase marks on the wheel stud and the brake disc as shown.





2) Remove the brake disc. Then place a dial gauge as shown, and measure the end play while moving the hub in the axial direction.
Limit: 0.05 mm (0.002 inch)
3) If the end play exceeds the limit, replace the hub assembly.
4) If the end play does not exceed the limit, dephase the brake disc and secure it. Then recheck the brake disc run-out.





CAUTION
^ After a new brake disc is installed, always grind the brake disc with an on-the-car type brake lathe. If this step is not carried out, the brake disc run-out exceeds the specified value, resulting in judder.

^ When the on-the-car type lathe is used, first install a M12 flat washer on the stud bolt in the brake disc side according to the figure, and then install the adapter. If the adapter is installed with M12 flat washer not seated, the brake disc rotor may be deformed, resulting in inaccurate grinding.
^ Grind the brake disc with all wheel nuts diagonally and equally tightened to the specified torque 100 Nm (74 ft-lb). If all of the wheel nuts are not used, or the tightening torque is excessive or not equal, the brake disc rotor or drum may be deformed, resulting in judder.

5. If the run-out cannot be corrected by changing the phase of the brake disc, replace the brake disc or grind it with the on-the-car type brake lathe ("MAD, DL-8700PF" or equivalent).