Pontiac Grand Prix Service Manual page 201

DELCO-MORAINE POWER BRAKE 5A-7
HYDRAULIC PUSHROD
REACTION RETAINER
CONTROL VALVE
CONTROL VALVE RETAINER
FOAM FILTER
Fig. 5A-7 Exploded View
o f Power Piston
3. Wipe power piston hub with power brake lube.
that scribe marks align on front and rear shells (Fig.
5A- 14).
4. Push hub of power piston through rear housing seal.
NOTE: It i s important that the fiont shell be started
5. Wipe
O.D.
of reaction retainer with power brake
using only the handr, in order to make sure the housings
lube.
will be completely mated after assembly, and to eliminate
any possibility of cutting the diaphragm.
FRONT HOUSING
-
REPLACE
5. Insert square channel tube in end of tool J 22805-01,
and u s h i a crescent wrench, turn front housing
1. Place new front housing seal in center of front
clockwise until fully bcked-
housing so that flat surface of cup lies against bottom
of depression in housing.
6. Remove all tools.
2. Install new vacuum check valve grommet.
GAGING PROCEDURE (Fig. 5A-15)
3. Attach tool J 22805-01 to front housing. Lubricate
NOTE: GAGING IS TO BE PERFORMED WITH-
I.D. of support plate seal with power brake lube. OUT VACUUM.
4. Hold power piston return spring in position between
1. Place the gage J 22647 over the piston rod in a
front housing and power piston, then start front
position which will allow the gage to be slipped to the
housing into final position with hands, making sure
left or right without contacting the studs (Fig. 5A-15).