Specifications
PART
2-2-Brake System
2-1
1
the rear brake system outlet port (Fig.
4).
Movement of the differential valve
forces the switch plunger upward over
the tapered shoulder of the valve to
close the switch electrical contacts and
light the dual brake warning lamp,
signalling a brake system failure.
In the event a front brake system
failure should occur, greater pressure
from the rear brake system during
brake pedal operation forces the valve
forward, moving the switch plunger
upward onto the valve ramp to light
the brake system warning lamp. How-
ever, failure of either the front or
rear system does not impair operation
of the
other brake system.
DISC BRAKE ASSEMBLIES
Disc brakes are available as op-
tional equipment for the front wheels.
The hydraulic brake system employs
single
-anchor, internal expanding and
self-adjusting drum brake assemblies
on the rear wheels of vehicles with
disc brakes, and on the front and rear
wheels of all others.
A
vacuum booster is available as
optional equipment.
The master cylinder converts phys-
ical force from the brake pedal (and
booster if so equipped) into hydraulic
pressure against the pistons in the
I
calipers (disc brakes) or in the wheel
Car Model Type Of Brake
Identifiation Code
Power Disc
B
Fairlane and Falcon Power Drum S
Standard Drum T
Power Disc M
Mustang Power Drum
X
Standard Drum T
Comet Power Disc
B
Power Drum
S
Standard Drum T
Cougar Power Disc M
Power Drum
X
Standard Drum T
FIG. 3-Dual Master Cylinder Identification
cylinders (drum brakes). The pistons
in turn convert hydraulic pressure
back into physical force at the brake
shoes.
RELATION AND FUNCTION
OF COMPONENT PARTS
The disc brake is a fixed caliper,
opposed piston, non-energized, venti-
lated disc type, actuated by a hy-
draulic system (Fig. 5). There is no
lateral movement of either the disc
(rotor) or the caliper. The caliper
assembly consists of two caliper
housings bolted together with each
half containing two cylinder bores
of
1 15/16 inch diameter. Each cyl-
inder bore contains a piston with an
attached molded rubber dust boot
I
BRAKE WARNIFIS LAMP SWITCH BRAKE WARNING LAMP SWITCH
I
VALVE PISTON HAS MOVED TO LOW PRESSURE AREA.
VALVE PISTON
;S
CENTRALIZED.
WARNING LAMP SWITCH PLUNGER IS DEPRESSED,
BRAKE
FLUID
PRIMARY AND SECONDARY SYSTEM
LIGHTING THE BRAKE WARNING LAMP PRESSURES ARE EQUALIZED
H1471-A
FIG. 4-Pressure Differential Valve and Brake Warning Lamp Switch Operation