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

Caution: Two different designs of the front brake rotors and front brake pads are used on this vehicle. Do NOT interchange first design and second design parts, or a loss of braking and personal injury could occur.

1. If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to Front Disc Brake Pads Replacement and/or Rear Disc Brake Pads Replacement .
2. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.



3. Using a micrometer calibrated in thousanths-of-a-millimeter, or ten-thousanths-of-an-inch, measure and record the thickness of the brake rotor at four or more points, evenly spaced around the rotor.

Ensure that the measurements are only taken within the friction surfaces and that the micrometer is positioned the same distance from the outer edge of the rotor, about 13 mm (½ in), for each measurement.

4. Compare the lowest thickness measurement recorded to the following specifications:

Specification

•	Front brake rotor minimum allowable thickness after refinishing: First design before VIN 5U129029 31.08 mm (1.224 in).

•	Front brake rotor minimum allowable thickness after refinishing: Second design after VIN 5U129029 28.66 mm (1.125 in).

•	Front brake rotor (J55) minimum allowable thickness after refinishing: 37.0 mm (1.457 in).

•	Rear brake rotor minimum allowable thickness after refinishing: 10.25 mm (0.404 in).

•	Rear brake rotor (J55) minimum allowable thickness after refinishing: 28.0 mm (1.102 in).

•	Front brake rotor discard thickness: First design before VIN 5U129029 30.7 mm (1.209 in).

•	Front brake rotor discard thickness: Second design after VIN 5U129029 28.5 mm (1.122 in).

•	Front brake rotor (J55) discard thickness: 36.5 mm (1.437 in).

•	Rear brake rotor discard thickness: 9.0 mm (0.354 in).

•	Rear brake rotor (J55) discard thickness: 27.5 mm (1.083 in).

5. 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.
6. 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.
7. If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification, the rotor requires replacement.