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Brake Rotor Thickness Variation Measurement

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  1. If the inboard friction surface of the brake rotor is not accessible, reposition and support the caliper with the brake pads. See BRAKE PADS  under REMOVAL & INSTALLATION.
  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 1/2 " (13 mm), for each measurement.
  4. Calculate the difference between the highest and lowest thickness measurements recorded to obtain the amount of thickness variation. Compare the thickness variation measurement to the following specification. See BRAKE SPECIFICATIONS  .
  5. If the brake rotor thickness variation measurement exceeds the specification, the rotor requires refinishing or replacement.
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