Brake Rotor Surface and Wear Inspection

Brake Rotor Surface and Wear Inspection

Tools Required:
J 26900-1 Combimike Micrometer

1. Reposition and support the caliper and the brake pads. Refer to Brake Pads Replacement - Front or to Brake Pads Replacement - Rear as applicable. Service and Repair
2. Clean the brake pad lining contact surfaces of the brake rotor with denatured alcohol or an equivalent brake cleaner.
3. Inspect the braking surfaces of the brake rotor for the following braking surface conditions:
^ Heavy rust and/or pitting
Use an abrasive disc in order to remove light surface rust.
Refinish the rotor in order to remove heavy surface rust and/or pitting.
^ Cracks and/or heat spots
^ Excessive blueing discoloration
4. If the braking surfaces of the brake rotor exhibits one or more of the braking surface conditions, refinish or replace the brake rotor.
5. Compare the thickness variation measurement to the following specification:
Specification
^ The maximum thickness variation of the front rotors is 0.025 mm (0.001 in).
^ The maximum thickness variation of the rear rotors is 0.025 mm (0.001 in).

Important: Brake rotor thickness variation greater than the specification can cause brake pulsation.

6. If the brake rotor thickness variation measurement exceeds the specification, refinish or replace the rotor. In order to refinish the rotor, refer to Brake Rotor Refinishing. In order to replace the rotor, refer to Brake Rotor Replacement - Front or to Brake Rotor Replacement - Rear as applicable.
7. If you refinish or replace the rotor, measure the assembled lateral runout (LRO) of the rotor in order to verify the performance of the disc brake system. Refer to Brake Rotor Assembled Lateral Runout (LRO) Measurement. Brake Rotor Assembled Lateral Runout (LRO) Measurement