Brake Rotor Thickness Measurement
Brake Rotor Thickness Measurement1. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
2. Using a micrometer calibrated in ten-thousandths of an inch, measure and record the lowest thickness of the brake rotor at four or more points, evenly 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 outer edge of the rotor for each measurement.
3. Compare the lowest thickness measurement recorded to the following specifications:
Specification
Front brake rotor minimum allowable thickness after refinishing FWD: .........31.7 mm (1.25 inch)
Front brake rotor minimum allowable thickness after refinishing AWD: .........28.58 mm (1.125 inch)
Rear brake rotor minimum allowable thickness after refinishing: .........10.0 mm (0.39 inch)
4. If the lowest thickness measurement of the brake rotor is above the minimum allowable thickness after refinishing specification; the rotor may be able to 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; the rotor may not be refinished.
6. Compare the lowest thickness measurement recorded to the following specifications:
Specification
Front brake rotor discard thickness FWD: ..........30.7 mm (1.21 inch)
Front brake rotor discard thickness AWD: ..........27.0 mm (1.063 inch)
Rear brake rotor discard thickness. .........9.0 mm (0.35 inch)
7. If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification, the rotor requires replacement.