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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

Firstly, exceeding the maximum allowable diameter of a brake drum can detrimentally affect the vehicle's braking performance. When the diameter is too large, the brake shoes may not make proper contact with the drum surface. This reduced contact area limits the friction generated during braking, which can lead to increased stopping distances—an alarming safety hazard in emergency situations. Moreover, improper brake drum size can result in uneven wear of brake components, leading to further complications and costs for maintenance.
maximum allowable brake drum diameter
