Joining Front And Rear Housings; Gaging Master Cylinder Piston - Pontiac Grand Prix Service Manual

HEAVY
DUTY POWER BRAKES 5D-Q
Thin lip of bearing will protrude to outside of housing.
40. Coat I.D. of primary power piston bearing with
silicone lubricant.
41. If check valve grommet was removed during
servicing, replace with new grommet in front housing.
POWER CYLINDER
-
ASSEMBLE
1. Secure power section front housing to tools J 8433
and J 6407-02 as shown in Fig. 5D-13.
2. Secure front housing to arbor press.
3. Position power piston return spring over inset in
front housing.
4. Place piston rod retainer plate on end of power
piston return spring in front housing.
5. Assemble power piston group to rear housing by
pressing tube of primary power piston through rear
housing bearing. Press down until housing divider
seats in rear housing and primary power piston
bottoms against housing.
6. Assemble rear housing to spanner wrenches J 9504
as shown in Fig. 5D-14.
Fig. 5D-15 Joining Front and Rear Housings
.
2. Insert master cylinder piston rod, flat end first, into
piston rod retainer.
3. Press down on master Qlinder piston rod to assure
that it is properly seated.
7. Hold rear housing assembly (with mounting studs
up) over front housing, so that scribe marks will be
aligned when housings are locked together.
NOTE: While joining the housings, care must be taken
to assure that the piston rod retainer plate is centered on
the piston rod retainer.
8. Slowly compress assembly keeping in a parallel
plane. (Fig. 5D- 15).
CAUTION: Do not compress aaembly to the point of
damaging power unit.
9. When front and rear housings are mated, rotate
spanner wrenches until housings are locked together.
10. Release pressure from assembly and remove all
tools from unit.
11. Place front housing seal in cavity of front housing,
making sure flat surface of cup lies against bottom of
depression in housing.
12. Place felt silencer in dust boot, and push to closed
end. Insert boot retainer over boot. Stretch boot over
pushrod and over flange in center of rear housing.
GAGING PROCEDURE (FIG. 5D-16).
1. Place power cylinder assembly in padded vise (front
housing up). DO NOT CLAMP TIGHT.
Fig. 50-16 Gaging Master Cylinder Piston
Rad