Brake Booster

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Automotive Brake Booster
Automotive Brake Booster

A brake booster in a vehicle, is used to make braking easier. Without a brake booster you would have to push down on the brake pedal extremely hard,in order to bring the vehicle to a stop. This is achieved by a difference in atmospheric pressure and the engine's manifold vacuum. The brake booster increases the pedal force 2 to 4 times depending on the size of the diaphragm.

The brake booster is the round drum located between the brake pedal and the master cylinder usually mounted to the firewall. When pressure is applied to the brake pedal, pressure is exerted on the booster air valve. When this pressure is created by the brake booster the master cylinder is engaged. Should the booster malfunction, the normal mechanical braking force of the master cylinder is maintained and you can still stop the vehicle but more force is required when applying the brakes.

The brake booster consists of the body, booster piston, piston return spring, reaction mechanism, and control valve mechanism. The body is divided into a constant pressure chamber and a variable pressure chamber. The chambers are separated from each other by a diaphragm. The control valve mechanism regulates the pressure inside the variable pressure chamber.

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