Brake Rotor Surface and Wear Inspection
- Clean the brake pad lining contact surfaces of the brake rotor with denatured alcohol or an equivalent approved brake cleaner. Inspect the braking surfaces of the brake rotor for the following braking surface conditions:
- Heavy rust and/or pitting, light surface rust can be removed with an abrasive disc; heavy surface rust and/or pitting must be removed by refinishing the rotor.
- Cracks and/or heat spots.
- Excessive blueing discoloration.
- If the braking surfaces of the brake rotor exhibit one or more of the braking surface conditions, replace the brake rotor. Using a micrometer calibrated in ten-thousands of an inch, measure and record the thickness variation of the brake rotor at 4 or more points, 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.
- Compare the thickness variation recorded to the following specification: Brake rotor maximum allowable thickness variation 0.0005" (0.013 mm). If the brake rotor thickness variation exceeds the specification, the rotor requires refinishing or replacement. See BRAKE ROTOR REFINISHING
or DISC BRAKE ROTOR
.