Town & Country V6-3.8L VIN L (2006)
two are internal. Service is the same for all boosters.
The power brake booster can be identified by the tag attached to the body of the booster (Fig. 65). This tag contains the production part number, the
date it was built, and who the manufacturer of the power brake booster is.
NOTE: The power brake booster assembly is not a repairable component and must be replaced as a complete assembly if found to be faulty in any
way. The check valve located on the power brake booster face is not repairable, but it can be replaced separately from the power brake booster.
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 (Fig. 64).
As the brake pedal is depressed, the power brake booster's input rod moves forward (Fig. 64). 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.