Brake Booster

INTRODUCTION  In Automobile Vehicles, Brake Boosters are used only on power brakes, not Manual Brakes.  The Booster’s Function is to give more Braking Power with minimum pressure on the Brake pedal.  If the Booster is not working properly,you will still have Brakes, but the Brake pedal will be very hard to Push.  The Brake Booster is located between the Brake pedal and the Master cylinder.  The basic principle of the Brake Booster is pressure differential.

Construction  The Brake Booster is made of Five Parts: - Body - Booster piston - Booster Return spring - Reaction valve - Control valve  The Body has Two Chambers —The variable pressure chamber and the constant pressure chamber separated by a diaphragm.

WORKING  As the driver steps on the brake pedal, atmospheric air is introduced in the variable pressure chamber, producing a pressure differential between the variable and the constant pressure chamber.  The force generated by the pressure differential on the plate is transmitted to the push rod via the booster piston which pushes the piston of the brake master cylinder.  When the pedal is depressed, All components return to its original positions through the return springs.

TYPES  The booster's size and whether it has a single or more than one diaphragm depend on the year, make and model of the vehicle.  When ordering a new booster, tell the auto parts store or dealer the year, make and model of your vehicle, and they will give you the correct one.

Thank you.