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Another important feature of drum brakes is the wheel cylinder, which is located at the top of the brake assembly. The wheel cylinder contains two pistons that move outwards when hydraulic fluid is pressed into the cylinder. This movement causes the brake shoes to expand and press against the drum. The design of the wheel cylinder is crucial, as it ensures even distribution of pressure on both brake shoes, promoting uniform wear and effective braking.
construction of drum brake

One key aspect Scotty discusses is the need for regular inspections. Drum brakes can accumulate dust and debris over time, which can lead to reduced braking performance. Scotty often advises checking the condition of the brake shoes and drum surface for signs of wear or damage. If the shoes are worn down to a certain point, they need to be replaced to maintain effective braking performance.
scotty kilmer drum brakes
