Front Brake Disc Run-Out Check and Correction

FRONT 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:
0.06 mm (0.0024 inch) [Front]
0.08 mm (0.0032 inch) [Rear]





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, which run-out is excessive as shown.





2) Remove the brake disc. Set a dial gauge as shown in the figure, and measure looseness of the hub in the axial direction.

Limit: 0.05 mm (0.002 inch)

3) When the looseness exceeds the limit value, replace the front or rear hub assembly.
4) When the looseness is within the limit value, install the brake disc after changing the phase between the hub and the brake disc, then check the runout of the brake disc again.





CAUTION:
^ After a new brake disc is installed, always grind the brake disc with 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 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). When all numbers of 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).