inboard port of the junction block supplies the right
front and left rear brakes. The outboard port of the
junction block supplies 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 tubes connect to the inboard
port of the ICU, and the secondary outlet port outlet
tubes connect to the outboard port of the ICU.
VACUUM BOOSTER
The purpose of the vacuum operated power brake
booster. Is to reduce the amount of force applied to
the brake pedal by the drivers foot. To obtain the
required hydraulic pressure in the brake system to
stop the vehicle.
This vehicle utilizes a Bosch vacuum booster for all
applications.
The power brake booster can be identified if
required, by the tag attached to the body of the
booster assembly (Fig. 7). This tag contains the fol-
lowing information. The production part number of
the power booster assembly, the date it was built and
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.
Fig. 4 Rear Disc Brake Assembly
Fig. 5 Drum In Hat Braking Disc
Fig. 6 Proportioning Valve
5 - 6
BRAKES
300M
DESCRIPTION AND OPERATION (Continued)