C 2500 Truck 2WD V8-5.7L VIN R (1997)
Vacuum Brake Booster: Description and Operation
The vacuum booster is a tandem diaphragm vacuum suspended unit. During normal operation, with the brake pedal released, manifold vacuum is applied
to both sides of the diaphragms. Applying the brakes allows air at atmospheric pressure to enter one side of each diaphragm. This pressure difference
provides the power assist. The booster assembly is located on the left front cowl and serves as the mounting surface for the master cylinder.
