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Using the caliper or micrometer, measure the inner diameter of the brake drum. If the drum displays a lip or ridge from wear, ensure your measurement captures the least-worn area. A typical brake drum has a specified maximum permissible diameter, which can be found in the vehicle’s service manual. This measurement is critical; if the drum exceeds its maximum diameter due to wear, it may need to be replaced.
how to measure a drum brake

Another important part of the brake drum assembly is the wheel cylinder. Located within the drum, the wheel cylinder is responsible for applying hydraulic pressure to the brake shoes. It consists of two pistons housed within a cylinder. When the brake pedal is pressed, brake fluid flows into the wheel cylinder, pushing the pistons outward and forcing the brake shoes against the drum. This hydraulic mechanism is crucial for delivering consistent and powerful braking force.
parts of brake drum
