Brake Drum Diameter Measurement
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
- Clean the brake shoe lining contact surface of the brake drum with denatured alcohol or an equivalent brake cleaner.
- Using a brake drum micrometer calibrated in thousands of an inch, measure and record the largest diameter of the brake drum at four or more points, equally spaced around the drum. Ensure that the measurements are only taken within the brake shoe lining contact area and that the micrometer is positioned the same distance from the outside edge of the drum for each measurement.
- Compare the largest diameter measurement recorded to Brake Drum Maximum Allowable Diameter After Resurfacing and Brake Drum Discard Diameter. See DISC & DRUM BRAKE SPECIFICATIONS .
- If the largest diameter measurement of the brake drum is less than the specification, the drum may be able to be resurfaced, depending upon surface and wear conditions which may be present.
- If the largest diameter measurement of the brake drum is equal to or greater than the specification, the drum may not be resurfaced.
- If the largest diameter measurement of the brake drum is equal to or greater than the discard specification, the drum requires replacement.