Brake Rotor Thickness Measurement
WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, and 2003 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Prior to performing any work, review warnings, cautions and notes. See ADJUSTMENTS & INSPECTIONS WARNINGS, CAUTIONS & NOTES under SERVICE PRECAUTIONS.
- Clean the brake pad lining contact surface of the brake rotor with denatured alcohol or an equivalent brake cleaner.
- Using a calibrated micrometer, measure and record the lowest thickness of the brake rotor at 4 or more points, equally spaced around the rotor. See Fig 1. 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 rotor minimum allowable thickness after refinishing and the rotor discard thickness specifications. See DISC BRAKE SPECIFICATIONS .
- 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. See BRAKE ROTOR REFINISHING under SERVICING.
- 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.
- If the lowest thickness measurement of the brake rotor is at or below the discard thickness specification then the rotor requires replacement. See BRAKE ROTOR under REMOVAL & INSTALLATION.