Brake Disc Thickness Check

BRAKE DISC THICKNESS CHECK






1. Remove dirt and rust from the brake disc surface.
2. 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: 24.0 mm (0.9 inch)
Minimum limit: 22.4 mm (0.88 inch)

NOTE: Thickness variation (at least 8 positions) should not be more than 0.015 mm (0.0006 inch).

3. If the disc thickness is less than 22.4 mm (0.88 inch) thick, replace it with a new one. If thickness variation exceeds the specification, turn rotor with an on-the-car type brake lathe ("Accuturn-8750" or equivalent). If the calculated final thickness after turning the rotor is less than the standard value, replace the disc.


1. Remove dirt and rust from the brake disc surface.





2. Measure the disc thickness at four positions or more.
Standard value: 10.0 mm (0.4 inch)
Minimum limit: 8.4 mm (0.33 inch)
3. Thickness variations (at least 4 positions) should not be more than 0.015 mm (0.0006 inch).
4. If the disc is thickness than 8.4 mm (0.33 inch) thick, replace it with a new one. If thickness variation exceeds the specification, turn rotor with an on-the-car brake lathe ("Accuturn-8750" or equivalent).
If the calculated final thickness is less than the standard value, replace the disc.