Brake Wheel Cylinder Replacement

Brakes are located at each wheel to enable the vehicle to come to a complete stop.

The brake wheel cylinder applies pressure to the brake shoes. The brake shoes apply pressure to the brake drum, which in turn slows down or stops the vehicle.

Drum brake systems are generally used on the rear of modern vehicles. The brake drum is attached to the wheel and rotates along with it. As the brakes are applied, brake shoes are pushed into contact with the brake drum, slowing the vehicle. The harder the brakes are applied, the more firmly the brake shoes press against the brake drums, resulting in the vehicle stopping in a shorter distance.

Over time, the wheel cylinders may deteriorate and may not be able to contain the brake pressure, resulting in a loss of brake fluid. To replace the brake wheel cylinder, the technician removes the wheel and brake drum. The brake shoes and associated hardware are then removed. The brake wheel cylinder is replaced, the brake components are reinstalled, and brake fluid is added to the brake reservoir. The brake pedal is then depressed continuously, forcing fresh fluid out to each wheel. The pressure opens a brake "bleeder screw" at each wheel. The brake pedal is continually depressed until fresh brake fluid exits all wheels.

A leaking wheel cylinder will contaminate the brake linings and greatly reduce the brake system's performance. Brake fluid naturally absorbs moisture from the surrounding air. Moisture is an enemy of any hydraulic system; it lowers the operating efficiency of the entire brake system and may result in costly repairs if the brake fluid is not periodically replaced.