Brake Rotor Surface and Wear Inspection
WARNING:
- If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to the following procedures for the necessary steps:
- Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
- Inspect the friction 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
- Heavy rust and/or pitting
- If the friction surfaces of the brake rotor exhibit one or more of the Braking Surface Conditions, the rotor requires refinishing or replacement.
Using a micrometer (1) calibrated in thousandths-of-a-millimeter, or ten-thousandths-of-an-inch, measure and record the scoring depth of any grooves present on the rotor friction surfaces.
- Compare the groove scoring depth recorded to disc brake component specifications. Disc Brake Component Specifications
- If the brake rotor scoring depth exceeds the specification, or if an excessive amount of scoring is present, the rotor requires refinishing or replacement.