Power Brake Booster

DESCRIPTION






All vehicles use a 205 mm tandem vacuum operated Dower brake booster






The power brake booster mounts on the engine side of the dash panel. It is externally connected to the brake system by an input push rod to the brake pedal. A vacuum line connects the booster to the intake manifold. The master cylinder is bolted to the front of the booster.
The power brake booster can be identified (if required) by the tag attached to the body of the booster. This tag contains the following information:
^ Production part number
^ Build date
^ Manufacturer

NOTE: The vacuum booster assembly is not a repairable part and must be replaced as a complete unit if it is found to be faulty in any way. The check valve used in the vacuum booster is not repairable but can be replaced as a separate component of the vacuum booster.

OPERATION
The purpose of the power brake booster is to reduce the amount of force required by the driver to apply the brakes and stop the vehicle when the brake pedal is pressed.
The power brake booster is vacuum operated. The vacuum supply comes from the intake manifold on the engine through a hose and the vacuum check valve mounted in the front of the booster.
As the brake pedal is depressed, the vacuum booster input rod moves forward. This movement opens and closes valves in the booster, creating a vacuum on one side of a diaphragm and allowing atmospheric pressure to enter on the other. This difference in pressure forces the output rod of the booster out against the primary piston of the master cylinder. As the pistons in the master cylinder move forward, hydraulic pressure is created in the brake system.