Service Overview

Over time, the force applied to wheel cylinders causes them to leak or wear away, which can reduce the reliability and response time of your brakes. As an integral part of the drum brake system, wheel cylinders are most commonly situated directly above each wheel, perpendicular to the direction the wheel travels.

Consisting of a small cylinder with a piston on each end, wheel cylinders are at opposite end of the brake line to the brake pedal, so when the pedal is pressed the brake fluid is forced into the cylinders which pushes the pistons out. In turn, the pistons push the brake shoes into contact with the wheel drums, slowing the vehicle through the friction this generates.

Frequently Asked Questions

The wheel cylinder consists of a cylinder that has two pistons, one on each side. Each piston has a rubber seal and a shaft that connects the piston with a brake shoe. When brake pressure is applied, the pistons are forced out pushing the shoes into contact with the drum.

Mushy brake pedal
Poor brake response
Brake fluid leaks
Vehicle pulls to one side when braking
Uneven brake pad wear

Most cars have 2 wheel cylinders (one for each rear wheel on drum brake systems). The wheel cylinder consists of a cylinder that has two pistons, one on each side. Each piston has a rubber seal and a shaft that connects the piston with a brake shoe.

When the brake shoes or the brake drums are replaced, it is advisable to replace the wheel cylinder at the same time. This will avoid follow-up repairs having to be made soon after. A damaged wheel cylinder will impair braking performance and lead to loss of brake fluid.

It comprises a housing made from grey cast iron or in the case of newer models aluminium, which is more lightweight. Other components include:

One or two pistons
Sleeves
Compression springs
Gaskets
Protective caps
Bleeder valves

Wheel Cylinder Repair & Replacement

Service Overview

Frequently Asked Questions

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