Overhaul Bendix Power Brake - Pontiac Grand Prix Service Manual

5B-2
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PONTIAC SERVICE MANUAL
CONTROL VALVE ASSEMBLY
(VALVE ROD & PLUNGER)
R E A R HOUSING
Fig. 58-2 Power Brake
-
Exploded View
STOP LAMP SWITCH
See Section 5 for service.
OVERHAUL BENDIX POWER BRAKE
MASTER CYLINDER ONLY
-
REMOVE
Certain
repair operations, such as replacement of
master cylinder internal parts, permit the master
cylinder to be removed by itself, leaving the power
cylinder on the
car.
1. Disconnect hydraulic lines at master cylinder, pump
fluid from cylinder into a container and dispose of
fluid. Cover openings in master cylinder and ends of
both pipes to prevent entry of dust, dirt, etc.
2. Remove master cylinder attaching nuts and lack
washers. Remove master cylinder from vacuum power
section.
2. Remove clevis pin retainer from brake pedal inside
the car.
3. Remove nuts from vacuum cylinder studs under
dash and remove vacuum power section.
4. Clean exterior of power brake.
POWER UNIT
-
DISASSEMBLE (Fig. 58-2)
1. Using tool
J
2280541, mount power brake assembly
in vise, clamping on tool so that valve operating rod is
UP.
2. Scribe a line across the front and rear housings to
facilitate reassembly.
3. Using tool J 9504, press down firmly and rotate tool
and housing clockwise so that cut-outs in rear housing
line up with indentation of front housing.
CAUTION: Remove rear housing carefilly as it is
spring-loaded and will tend to fly away from the front
housing.
POWER BRAKE VACUUM CYLINDER
-
REMOVE
4. Remove tool, housing, hydraulic push rod from
diaphragm plate (power piston) and return spring
1. Remove vacuum hose from'. front housing and from front housing.
discard grommet. Remove master cylinder and posi-
tion away from power section. DO NOT disconnect
5. Remove assembly from vise and remove tool
J
fluid lines.
2280541 from front housing.