Brake Rotor Thickness Measurement
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Refer to Brake Dust Caution
in Cautions and Notices.
- Clean the brake pad lining contact surface of the brake rotor with denatured alcohol or an equivalent brake cleaner.
- Using a micrometer calibrated in ten-thousands of an inch, measure and record the lowest thickness of the brake rotor at four 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.
- Compare the lowest thickness measurement recorded to the following specifications:
Specification:
- Front brake rotor discard thickness 27.5 mm (1.08 in).
- Rear brake rotor discard thickness 18.50 mm (0.728 in).
- If the lowest thickness measurement of the brake rotor is above the brake rotor discard thickness; the rotor may be refinished, depending upon the surface and wear conditions which may be present.
- If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification; the rotor requires replacement.