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The wheel cylinder is central to the operation of drum brakes. It contains two pistons—one for each brake shoe. As hydraulic fluid enters the expanded wheel cylinder, it pushes the pistons outward, causing the shoes to press against the drum. Understanding this mechanism is crucial for diagnosing problems; if one side of the cylinder fails, it can lead to uneven braking and potential safety hazards.
drum brake line diagram

Another possibility is that debris or rust is inhibiting the drum from sliding over the shoes. It’s essential to clean the mating surfaces thoroughly. Use a wire brush or sandpaper to remove any rust or buildup on both the brake shoes and the drum itself. Additionally, inspect the inside of the drum for scoring or damage, which might require resurfacing or replacement.
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