Power Piston Disassemble; Power Piston Exploded View - Pontiac Grand Prix Service Manual

HEAVY DUTY POWER BRAKES 5D-3
PRIMARY PRIMARY POWER HEAD PRIMARY POWER
DIAPHRAGM SUPPORT SILENCER PISTON
FLOATING CONTRO
VALVE RETAINER
PISTON ROD
RETAINER
SECONDARY POWER
PISTON BEARING
SUPPORT RING
i
Fig. 50-3 Power Piston
-
Exploded View
remove primary piston bearing from center opening of
rear housing.
POWER PISTON
-
DISASSEMBLE (Fig. 5D-3)
CAUTION: Exercise extreme care in handling power
phton, rubber surfaces and metal parts in this assembly.
They should be guarded against grease, oil and foreign
matter and must be protected fiom nicks or cuts that
might be caused by rough suqaces or damaged tools.
1. Lift bead on O.D. of secondary diaphragm and
remove diaphragm support ring.
2. Remove piston rod retainer and piston rod from
secondary piston.
3. Mount double-ended tool J 23101 (with large
diameter end up) in a vise. Position the secondary
power piston so that the two radial slots in piston fit
over ears of tool (Fig. 5D-4).
NOTE: It is possible that the primary support plate will
unlock fiom the primary piston before the primary piston
unscrews fiom the secondary piston. If this happens,
continue to turn primary support plate counterclockwise.
Tabs ("stops") on primary support plate will temporarily
lock-primary support plate to primary power piston and
pennit continued counterclockwise rotation to unscrew
primwy power piston fiom secondary power piston.
5. Remove housing divider from secondary power
piston. Remove secondary power piston bearing from
housing divider.
6. The secondary power piston should still be posi-
tioned on tool J 23 101. Fold back secondary dia-
phragm from O.D. of secondary support plate. Grip
edges of support plate with hands and rotate clockwise
to unlock secondary support plate from secondary
power piston.
7. ' ~ e m o v e secondary diaphragm from secondary
support plate.
4. Fold back primary diaphragm from O.D. of primary
8. Remove reaction piston and rubber reaction disc
support plate. Grip edge of support plate with hands
from enter of secondary power piston by pushing
and rotate counterclockwise to unscrew primary power
down on end of reaction piston with a small object,
piston from secondary power piston. (Fig. 5D-5).
such as a pencil, wooden dowel, or metal rod.