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Return springs are essential for retracting the brake shoes after the brake pedal is released. They pull the shoes back into position, preventing them from dragging against the drum, which would lead to excessive wear and reduced fuel efficiency. Proper tension in the return springs is critical for the quick and effective operation of the brake system.
list the parts of a drum brake assembly

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
