- Clean the brake pad lining contact surface of the brake rotor with denatured alcohol or an equivalent brake cleaner.
- Using a micrometer calibrated in ten-thousands of an inch, measure and record the lowest thickness of the brake rotor at four or more points, equally spaced around the rotor.
- Compare the lowest thickness measurement recorded to the following specifications:
- 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.
- 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.
- If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification; the rotor requires replacement.
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.
Specification (JB6)
| • | Brake rotor minimum allowable thickness after refinishing 31.25 mm (1.23 in). |
| • | Brake rotor discard thickness 30.86 mm (1.215 in). |
Specification (JD7 Gas)
| • | Brake rotor minimum allowable thickness after refinishing 31.25 mm (1.23 in). |
| • | Brake rotor discard thickness 30.86 mm (1.215 in). |
Specification (JD7 Diesel)
| • | Brake rotor minimum allowable thickness after refinishing 37.59 mm (1.48 in). |
| • | Brake rotor discard thickness 37.21 mm (1.465 in). |
Specification (JB8)
| • | Brake rotor minimum allowable thickness after refinishing 37.59 mm (1.48 in). |
| • | Brake rotor discard thickness 37.21 mm (1.465 in). |
