Brake Disc Thickness Check
- Using a micrometer, measure disc thickness at eight positions, approximately 45 degrees apart and 10 mm (0.4 inch) in from the outer edge of the disc.
Standard value:
26.0 mm (1.02 inches) <Front (Except RALLIART)>
24.0 mm (0.94 inch) <Front (RALLIART)>
10.0 mm (0.39 inch) <Rear>
Limit:
24.4 mm (0.96 inch) <Front (Except RALLIART)>
22.4 mm (0.88 inch) <Front (RALLIART)>
8.4 mm (0.33 inch) <Rear>
NOTE: Thickness variation (at least 8 positions) should not be more than 0.015 mm (0.0006 inch).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 N.m (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.
- If the disc thickness is less than the limits, replace it with a new one. If thickness variation exceeds the specification, turn rotor with an on-the-car type brake lathe ("MAD, DL-8700PF" or equivalent). If the calculated final thickness after turning the rotor is less than the standard value, replace the disc.