Specifications

PART 2-2-Brake System 2-1 3
CLIP MUST NOT TOUCH OR COVER
RUBBER
RING AROUND OUTSIDE
OF VALVE
ASS,EMBLY
A
DlSC BRAKE PRESSURE
CONTROL VALVE
ASSEMBLY-ZBOPI B0LT-376459-S2
INSTALLATION-DISC BRAKES ONLY
TUBE-2265
TORQUE TO 6.15 LB. FT.
DlSC BRAKE CONTROL
TUBE-2265
PROPORTIONING VALVE
I
ASSEMBLY-26272 TUBE-2B113
FLAT SlDE 0F"D" SHAPED HOLE
MUST BE LOCATED ON INBOARD
SlDE OF HOSE BRACKET
HOSE-2A448
BOLT-376459.52
INSTALLATION-DISC BRAKES SAME AS
INSTALLATION-DISC
i3RAKE ALTERNATE ONLY
MAIN VIEW EXCEPT AS SHOWN
H1561-A
NG. 8-Disc Brake Pressure Control Valve
REAR BRAKE
NG. 9-Self-Adjusting Brake Assemblies-9 Inch Drum
A disc brake pressure control valve
located between the pressure differen-
tial valve and the rear brake wheel
cylinders provides balanced braking
action between the front and the rear
brakes under a wide range of braking
conditions (Fig.
8). By regulating the
hydraulic pressure applied to the rear
wheel cylinders, the valve limits rear
braking action when high pressures
are required at the front brakes. In
this manner.
Dremature rear wheel
skid is
prevdnied. The proportioning
valve is serviced as an
assemblv and
is never adjusted or overhauled.
HYDRAULIC SELF-ADJUSTING
BRAKE SYSTEM
The self-adjusting brake mecha-
nism consists of a cable, cable guide,
adjusting lever, and adjuster spring
(Figs.
9 and 10). The cable is hooked
over the anchor pin at the top and is
connected to the lever at the bottom.
The cable is connected to the sec-
ondary brake shoe by means of the
cable guide. The adjuster spring is
hooked to the primary brake shoe
and to the lever. The automatic ad-
juster operates only when the brakes
are applied while the car is moving
rearward and only when the second-
ary shoe is free to move toward the
drum beyond a predetermined point.
With the vehicle moving rearward
and the brakes applied, the wrap-
around action of the shoes follow-
ing the drum forces the upper end
of the primary shoe against the
anchor pin. The action of the wheel
cylinder moves the upper end of the
secondary shoe away from the an-
chor pin. The movement of the sec-
ondary shoe causes the cable to pull
the adjusting lever upward and
against the end of a tooth on the
adjusting screw star-wheel. The up-
ward travel of the lever increases as
lining wear increases. When the lever
can move upward far enough, it
passes over the end of the tooth and
engages the tooth. When the brakes
are released, the adjusting spring
FRONT BRAKE
pulls the lever downward causing the
star-wheel to turn and expand the
shoes. The star-wheel is turned one
tooth at a time as the linings pro-
gressively wear.
With the vehicle 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 are non-adjustable.
BRAKE BOOSTER SYSTEM
The diaphragm-type brake booster
is a self-contained vacuum-hvdraulic
braking unit mounted on thd engine
side of the dash panel. The brake
booster is of the vacuum suspended
type which utilizes engine intake