Brake Rotor Surface and Wear Inspection

Brake Rotor Surface and Wear Inspection

Caution: Refer to Safety Glasses Caution (Safety Glasses Warning) in Cautions and Notices.
Caution: Refer to Vehicle Lifting Caution (Service Precautions) in Cautions and Notices.
Caution: Refer to Brake Dust Caution (Brake Dust Caution) in Cautions and Notices.
1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle (Service and Repair) in General Information.
2. Remove the wheels. Refer to Tire and Wheel Removal and Installation (Service and Repair) in Tires and Wheels.
3. Clean the friction surfaces of the brake disc with denatured alcohol, or an equivalent approved brake cleaner.
4. Inspect the friction surfaces of the brake disc 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 brake disc.
* Cracks and/or heat spots
* Too much blueing, discoloration

5. If the friction surfaces of the brake disc exhibit one or more of the Braking Surface Conditions, the brake disc requires refinishing or replacement.




6. Using a micrometer calibrated in thousandths-of-a-millimeter, or ten-thousandths-of-an-inch, measure and record the scoring depth of any grooves present on the brake disc friction surfaces.
7. Compare the groove scoring depth recorded to the following specification:

Brake disc maximum allowable scoring: 1.50 mm (0.060 in).

8. If the brake disc scoring depth exceeds the specification, or if too much scoring is present, the brake disc requires refinishing or replacement.