brake fluid reservoir supplies the brake hydraulic
system with the necessary fluid to operate properly.
The primary and secondary outlet tubes of the
master cylinder are connected to a junction block on
non-ABS equipped vehicles. The tube from the mas-
ter cylinder primary outlet port connects to the
inboard port of the junction block, and the tube from
the secondary outlet port connects to the outboard
port of the junction block. The inboard port of the
junction block supplies the right front and left rear
brakes. The outboard port of the junction block sup-
plies the left front and right rear brakes.
On vehicles equipped with Antilock Brakes (with or
without Traction Control), the master cylinder pri-
mary outlet port outlet tube connects to the inboard
port of the ICU, and the secondary outlet port outlet
tube connects to the outboard port of the ICU.
The master cylinder reservoir cap diaphragm is slit
to allow atmospheric pressure to equalize on both
sides of the diaphragm.
POWER BRAKE BOOSTER
DESCRIPTION
The power brake booster assembly mounts on the
engine side of the dash panel. It is externally con-
nected to the brake pedal by an input push rod
extending out the rear of the booster (Fig. 3). The
master cylinder is bolted to the front of the power
brake booster assembly.
A vacuum check valve is mounted on the power
brake booster body. A vacuum line connects the
booster (check valve) to the intake manifold. Depend-
ing on the engine combination, different vacuum hose
routings are required.
The power brake booster can be identified by the
tag attached to the body of the booster assembly (Fig.
4). This tag contains the following information:
• the production part number
• the date it was built
• who manufactured it
NOTE: The power brake 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 power
booster vacuum check valve is not repairable but
can be replaced as an assembly.
OPERATION
The purpose of the power brake booster is to
reduce the amount of force required by the driver
(foot-pedal pressure) to obtain the required hydraulic
pressure in the brake system to stop the vehicle. This
vehicle utilizes a Bosch power brake booster to
accomplish this task in all brake applications.
The power brake booster is vacuum operated. The
vacuum is supplied from the intake manifold on the
engine through the vacuum hose and power brake
booster check valve (Fig. 3).
Fig. 2 Master Cylinder
1 – BOOSTER
2 – MASTER CYLINDER
3 – MASTER CYLINDER FLUID RESERVOIR
4 – FLUID LEVEL FULL MARK
5 – FLUID LEVEL SENSOR
Fig. 3 Power Brake Booster
1 – VACUUM CHECK VALVE
2 – OUTPUT ROD
3 – POWER BRAKE BOOSTER ASSEMBLY
4 – INPUT ROD
5 – MASTER CYLINDER MOUNTING STUDS (2)
6 – POWER BOOSTER ASSEMBLY TO DASH PANEL MOUNTING
STUDS (4)
LH BRAKES 5 - 3
DESCRIPTION AND OPERATION (Continued)
2000 LHS, 300M, CONCORDE AND INTREPID2000 LHS, 300M, CONCORDE AND INTREPID
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