Pontiac FIREBIRD 1972 Service Manual page 493

1972 PONTIAC SERVICE MANUAL
Fig. 5 0 - 2 0 Securing Rear Housing to Tools
NOTE: While joining the housings, care must
be taken to assure that the piston rod retainer
plate is centered on the piston rod retainer.
CAUTION: Do not compress assembly to the
point o f damaging power unit.
Slowly compress assembly keeping in a parallel plane
(Fig. 5D-2 1).
When front and rear housings are mated, rotate span-
ner wrenches until housings are locked together.
Release pressure from assembly and remove all tools
from unit.
Place front housing seal in cavity of front housing,
making sure flat surface of cup lies against bottom of
depression in housing.
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-22)
1. Place power cylinder assembly in padded vise (front
housing up). DO NOT CLAMP TIGHT
2. Insert master cylinder piston rod, flat end first, into
piston rod retainer.
3. Press down on master cylinder piston rod to assure
that it is properly seated.
4. Place gage J 22647 over piston rod in a position
Fig. 5 0 - 2 1 Joining Front and Rear Housings
which will allow gage to be slipped to the right or left
without contacting the studs (Fig. 5D-22).
NOTE: GAGING IS TO BE PERFORMED
WITHOUT VACUUM
The center section of the gage has two,levels. The piston
rod should always contact the longer section (lower level)
of the gage. The piston rod should never contact the
shorter section (higher level) of the gage. Move gage from
side to side to check piston rod height.
Any variation beyond these two limits must be compen-
sated for by obtaining the service adjustable pushrod, and
adjusting the self-locking screw to meet gaging specifica-
tions.
POWER CYLINDER ONLY
INSTALL
CAUTION: See caution on Page 1 of this section
regarding fasteners referred to in Steps 1 and 2
be10 w.
1. Mount power cylinder to dash. Install four power
unit to dash attaching nuts. Torque nuts to 24 lb. ft.
2. Attach pushrod "eye" to pedal arm pin with retainer
clip,
3. Position master cylinder over attaching studs and
install two nuts. Torque nuts to 25 lb. ft.
4. Install vacuum hose and vacuum check valve.
5. Check stop light switch adjustment (see Section 5).