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Brake Rotor Thickness Measurement

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix and 2002 Oldsmobile Intrigue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clean the brake pad lining contact surface of the brake rotor with denatured alcohol or an equivalent brake cleaner.
  2. Using a micrometer calibrated in ten-thousands of an inch, measure and record the lowest thickness of the brake rotor at 4 or more points, equally spaced 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.
  3. Compare the lowest thickness measurement recorded to the brake specifications. See FRONT DISC BRAKES  and REAR DISC BRAKES  under DISC BRAKE SPECIFICATIONS.
  4. If the lowest thickness measurement of the brake rotor is above the minimum allowable thickness after refinishing specification. The rotor may be able to be refinished, depending upon surface and wear conditions which may be present.
  5. If the lowest thickness measurement of the brake rotor is at or below the minimum allowable thickness after refinishing specification. The rotor may not be refinished.
  6. Compare the lowest thickness measurement recorded to the brake specifications. See FRONT DISC BRAKES  and REAR DISC BRAKES  under DISC BRAKE SPECIFICATIONS.
  7. If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification, the rotor requires replacement. See FRONT BRAKE ROTOR  or REAR BRAKE ROTOR  under REMOVAL & INSTALLATION.
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