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

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 JC3/JC4/JH2

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

•	Brake rotor discard thickness 27.50 mm (1.082 in)

Specification - Front Brake JH6

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

•	Brake rotor discard thickness 36.50 mm (1.437 in)

Specification - Rear Brake JC4/JH2

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

•	Brake rotor discard thickness 28.50 mm (1.122 in)

Specification - Rear Brake JH6

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

•	Brake rotor discard thickness 27.50 mm (1.082 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.