Lucerne V8-4.6L (2008)
Brake Rotor/Disc: Testing and Inspection
Brake Rotor Thickness Measurement
Brake Rotor Thickness Measurement
Caution: Refer to Brake Dust Caution (See: Service Precautions/Technician Safety Information/Brake Dust Caution).
1. If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. Refer to Front Disc Brake
Pads Replacement (See: Brake Pad/Service and Repair/Front Disc Brake Pads Replacement) and/orRear Disc Brake Pads Replacement (See:
Brake Pad/Service and Repair/Rear Disc Brake Pads Replacement).
2. Clean the friction surfaces of the brake rotor with denatured alcohol, or an equivalent approved brake cleaner.
3. Using a micrometer calibrated in thousanths-of-a-millimeter, or ten-thousanths-of-an-inch, measure and record the thickness of the brake rotor at
four or more points, evenly spaced around the rotor.
Ensure that the measurements are only taken within the friction surfaces and that the micrometer is positioned the same distance from the outer
edge of the rotor, about 13 mm (1/2 in), for each measurement.
4. Compare the lowest thickness measurement recorded to the following specifications. Refer to Disc Brake Component Specifications (See:
Specifications/Disc Brake Component Specifications).
5. If the lowest thickness measurement of the brake rotor is above the minimum thickness specification, the rotor may be able to be refinished,
depending upon surface and wear conditions which may be present.
6. If the lowest thickness measurement of the brake rotor is below the minimum allowable thickness after refinishing specification, the rotor may not
be refinished.
7. If the lowest thickness measurement of the brake rotor is below the minimum thickness specification, the rotor requires replacement.
