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(011)
FIG.
2-Booster in Released Position
expand the shoes. The star wheel is
turned one tooth at a time as the
linings progressively wear.
With the car moving forward and
the brakes applied, the secondary
shoe is against the anchor pin and
the primary shoe is moved toward
the drum. Therefore, the adjuster
does not operate.
The rear brake assembly is basic-
ally the same as the front brake. The
conventional parking brake lever,
link, and spring are used in the rear
brake.
The anchor pins on all brakes are
fixed and non-adjustable.
VACUUM PORT
(OPEN)
ATMOSPHERIC
PORT
(CLOSED)
FIG.
3-Booster in Applied Position
PART 2-2-BRAKE SYSTEM
D
ATMOSPHERIC PRESSURE
DvAcuuM
§
HYDRAULIC FLUID
H1067-C
BOOSTER SYSTEM
The booster assembly (Figs. 2 and
3) is mounted on the engine side
of the dash panel. A vacuum reser-
voir, mounted on the left front fen-
der splash shield, gets its vacuum
from the engine intake manifold.
When the engine is stopped, a check
valve traps vacuum in the reservoir.
The vacuum reservoir maintains
enough vacuum (after the engine has
stopped) for several power-assisted
brake applications. Should the power
unit fail, the car can still be braked,
although greater pedal pressure by
the driver will be necessary for a
given application.
~
HYDRAULIC FLUID
D
HYDRAULIC FLUID PRESSURE
H1077-C
t
MANUAL RELEASE
HANDLE
FIG.
4-Parking Brake
Control Assembly
2-7
H1292-A
The chamber in back of the boost-
er piston is at all times open to at-
mospheric pressure through an air
cleaner. When the pedal is in the
released position, the valve return
spring holds the valve operating rod
and plunger back against the piston
rear plate leaving the atmospheric
port open and the vacuum port
closed (Fig. 2) . The atmospheric
pressure in the rear chamber is free
to pass through the open· atmospheric
port of the valve and the porting in
the piston to the chamber area in
front of the piston. The booster pis-
ton is, therefore, balanced in atmos-
phere (atmospheric pressure on both
sides) and does not move.
FIG.
5-Parking Brake
Locking and Release Mechanism
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