Brake Rotor Thickness Measurement

Brake Rotor Thickness Measurement
Warning: Refer to Brake Dust Warning (Brake Dust Warning).




1. Clean the brake pad lining contact surface of the brake rotor with denatured alcohol or an equivalent brake cleaner.
2. Using a calibrated micrometer measure and record the lowest thickness of the brake rotor at 4 or more points equally spaced around the rotor.
Ensure that the measurements are only taken within the brake pad lining contact area and that the micrometer is positioned the same distance from the outside edge of the rotor for each measurement.
3. Compare the lowest thickness measurement recorded to the following specifications:

- Brake rotor minimum allowable thickness after refinishing 28.0 mm (1.102 in)
- Brake rotor discard thickness 27.50 mm (1.083 in)

- Brake rotor minimum allowable thickness after refinishing 37.0 mm (1.457 in)
- Brake rotor discard thickness 36.50 mm (1.437 in)

- Brake rotor minimum allowable thickness after refinishing 29.0 mm (1.142 in)
- Brake rotor discard thickness 28.50 mm (1.122 in)

- Brake rotor minimum allowable thickness after refinishing 28.0 mm (1.102 in)
- Brake rotor discard thickness 27.50 mm (1.083 in)

4. If the lowest thickness measurement of the brake rotor is above the minimum allowable thickness after refinishing specification then the rotor may be refinished, depending upon surface and wear conditions which may be present.
5. If the lowest thickness measurement of the brake rotor is at or below the minimum allowable thickness after refinishing specification then the rotor may not be refinished.
6. If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification then the rotor requires replacement.