For 1990-2009 cars

1. Clean the brake pad lining contact surface of the brake rotor with denatured alcohol or an equivalent brake cleaner.
2. 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.

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 rotor minimum allowable thickness after refinishing 26.5 mm (1.043 in).

• | Brake rotor discard thickness 25.0 mm (0.984 in).

Specification (Rear, Solid)

• | Brake rotor minimum allowable thickness after refinishing 11.0 mm (0.433 in).

• | Brake rotor discard thickness 10.0 mm (0.393 in).

Specification (Rear, Vented)

• | Brake rotor minimum allowable thickness after refinishing 19.0 mm (0.748 in).

• | Brake rotor discard thickness 18.0 mm (0.709 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.