Pontiac FIREBIRD 1972 Service Manual page 469

TANDEM DIAPHRAGM POWER BRAKE-BENDIX 5C-9
POWER BRAKE AND MASTER
CYLINDER ASSEMBLY
REMOVE
hydraulic push rod by pulling it straight out of front
shell.
1. Remove vacuum check valve from front housing and
discard grommet.
2. Disconnect pipes from master cylinder hydraulic
ports and cover openings in master cylinder and ends
of pipes to prevent entry of dust, dirt, etc.
3. Remove clevis pin retainer from brake pedal inside
the car.
4. Remove nuts from power cylinder studs and remove
power cylinder.
5. Clean exterior of power brake assembly and drain
reservoirs of hydraulic fluid.
MASTER CYLINDER AND EXTERNAL
PARTS
REMOVE
1. Remove the two master cylinder attaching nuts and
lockwashers and remove master cylinder. Remove
2. Carefully remove push rod boot and air filter from
valve rod.
VALVE ROD, RETAININERS FILTER AND
POPPET PARTS
REMOVE (Fig. 5C-6)
1. Carefully remove stamped steel hub protector and
foam air filter from valve hub. USE CARE TO AV-
OID DAMAGING PLASTIC HUB.
2. With valve rod in vertical position, squirt alcohol
down rod to wet rubber grommet in valve plunger on
ball end of valve rod.
CAUTION:
When separating valve rod from
plunger, hold power unit to prevent it from
falling to floor. Use care when prying with
wrenches to a void damaging plastic valve hous-
ing.
3. Reinstall hub protector. Position two small blocks of
wood on either side of eye and clamp this assembly
Fig. 5C-6 Valve Rod Retainers, Filters and Poppet