The wheel cylinder brake drum is a housing made of cast iron, with two aluminum pistons mounted inside of it, provided with thick rubber cuffs. At the outer ends of the pistons are inserted steel details, which reduce their wear out. From both sides the cylinder is equipped with rubber dust protection covers. Brake fluid enters the cylinder through the connecting pipe. The wheel brake cylinder has a special pumping valve, protected by a rubber cap, designed to release air from the car`s brake system. A spring-loaded thrust ring is inserted into the cylinder`s body. It serves to adjust the gap between the brake drum mechanism and the brake pads.

When you start braking, the cylinder piston moves forced by the pressure of brake fluid, and then squeezes the brake pad. Depending on how fast the wear out of pads is processing during braking, the piston stroke increases and the moment comes when he moves the thrust ring, breaking the force of its fitting. During pads reverse bias, under the influence of the inhibitor coupling spring, the thrust ring remains in this new place, because the spring force is insufficient to move it back. So there is an automatic increase of the gap between the pad and the drum. There are two types of wheel brake cylinders: single- and two-piston.

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All you need to know about brake cylinder: lifetime limits, common defects and their signs, tips and recommendations

Manufacturers do not specify operation lifetime of the wheel brake cylinder.