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A Brake Booster is a device that increases the force applied from the brake pedal to the master cylinder. The booster is what separates a power-assisted braking system from a manual one.

The most common type of brake booster uses Engine Vacuum. However, hydraulic boosters are also available. They use fluid pressure created by the power steering pump. Some vehicles also use an electric powered brake booster.

How does it work?

A vacuum booster is usually mounted on the firewall, in the engine compartment. It has a chamber divided in half by a diaphragm. The chamber is connected to a vacuum source, usually the intake manifold. It also has a shaft with valves running through the center.

The brake pedal is linked to one side of the booster. The Master Cylinder is mounted on the other side.