Caution: Refer to Brake Dust Caution in the Preface section.

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:

Specification - Front Brake (RPO JC4)

•	Rotor minimum allowable thickness after refinishing 28.0 mm (1.10 in)

•	Rotor discard thickness 27.50 mm (1.082 in)

Specification - Front Brake (RPOs JF3/JF7)

•	Rotor minimum allowable thickness after refinishing 28.0 mm (1.10 in)

•	Rotor discard thickness 28.0 mm (1.10 in)

Specification - Front Brake (RPO JH1)

•	Rotor minimum allowable thickness after refinishing 28.0 mm (1.10 in)

•	Rotor discard thickness 27.50 mm (1.082 in)

Specification - Front Brake (RPOs JH6/JH7)

•	Rotor minimum allowable thickness after refinishing 37.0 mm (1.46 in)

•	Rotor discard thickness 36.50 mm (1.437 in)

Specification - Rear Brake (RPO JC4)

•	Rotor minimum allowable thickness after refinishing 29.0 mm (1.142 in)

•	Rotor discard thickness 28.50 mm (1.122 in)

Specification - Rear Brake (RPO JH1)

•	Rotor minimum allowable thickness after refinishing 19.0 mm (0.748 in)

•	Rotor discard thickness 18.50 mm (0.728 in)

Specification - Rear Brake (RPO JH6)

•	Rotor minimum allowable thickness after refinishing 28.0 mm (1.102 in)

•	Rotor discard thickness 27.50 mm (1.082 in)

Specification - Rear Brake (RPO JH7)

•	Rotor minimum allowable thickness after refinishing 29.0 mm (1.142 in)

•	Rotor discard thickness 28.50 mm (1.122 in)

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. If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification; the rotor requires replacement.