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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

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
