Grand Caravan FWD V6-3.3L VIN 3 Flex Fuel (2002)
The different engine combinations used in this vehicle require different vacuum hose routings to the power brake booster. All vacuum hoses must be
routed from the engine to the power brake booster without kinks or excessively tight bends.
OPERATION
The power brake booster reduces the amount of force required by the driver to obtain the necessary hydraulic pressure to stop a vehicle. The power
brake booster is vacuum operated. The vacuum is supplied from the intake manifold on the engine through a vacuum hose and the power brake booster
check valve. As the brake pedal is depressed, the power brake booster's input rod moves forward. This opens and closes valves in the power booster
allowing atmospheric pressure to enter on one side of a diaphragm. Engine vacuum is always present on the other side. This difference in pressure
forces the output rod of the power brake booster out against the primary piston of the master cylinder. As the pistons in the master cylinder move
forward this creates the hydraulic pressure in the brake system.
