Installing Housing Divider - Pontiac Grand Prix Service Manual

HEAVY DUTY POWER BRAKES 5D-7
placing reaction piston, small diameter fust, through
large cavity and into smaller cavity.
c. With secondary power piston up, push on reaction
piston to insure that it is seated on air valve.
d. Place gage J 23337 in secondary power piston so
that outer edges rest on bottom of large cavity, and
center section of gage rests over "nose" of reaction
piston. Both ends of gage must be used'to perform
gaging operation.
e. Move gage to left or right of "nose" on reaction
piston. Reaction piston is correct length if "nose" of
piston hits "NO GO" level of gage and clears "GO"
level of gage, while permitting outer edges of gage to
remain seated on larger cavity of secondary power
piston.
NOTE: If reaction piston is too long, "GO" level of gage
will not clear "nose" without moving outer edges of gage
off the seat in large cavity of power piston. If reaction
piston is too short, both levels of gage will clear "nose"
of reaction piston. If either condition exists, a separate
kit of three selective reaction pistons (differing in length
and color) must be obtained to permit use of piston that
meets correct size requirements of step (e).
Care must be taken to insure that gage is 'not
"cocked".
11. After determination of correct reaction piston,
apply a light film of silicone lubricant to O.D. of
rubber reaction disc, place disc in large cavity of
secondary power piston and push disc down to seat on
reaction piston.
12. Unlock secondary power piston from primary
power piston.
13. Assemble primary diaphragm to primary support
plate from side of support plate opposite locking tangs.
Press raised flange on I.D. of diaphragm through
center hole of support plate. Be sure that edge of
support plate center hole fits into groove in raised
flange of diaphragm. Lubricate diaphragm I.D. and
raised surface of flange (that fits into groove in
ptimary power piston) with light coat of silicone
lubricant.
14. Mount Tool J 23101 (small diameter end up) in a
vise. Position primary power piston so that the two
radial slots in piston fit over ears of tool.
15. Fold primary diaphragm away from O.D. of
primary support plate.
16. Holding edges of support plate, with locking tangs
down, place primary support plate and diaphragm
assembly over tube of primary power piston. Flange
on I.D. of primary diaphragm will fit into groove in
primary power piston.
Fig. 5D.12 Installing Housing Divider
17. Grip edges of primary support plate, press down,
and rotate clockwise until tabs on primary power
piston contact the stops on support plate.
18. Place power head silgncer on tube of primary
power piston so that holes at base of tube are covered.
19. Apply silicone lubricant to O.D. of primary power
piston tube.
20. Remove primary piston assembly from Tool J
23101 and lay it aside.
2 1. Assemble secondary diaphragm to secondary
support plate from side of support plate opposite
locking tangs. Press raised flange on I.D. of diaphragm
through center hole of support plate. Be sure that edge
of support plate center hole fits into groove in raised
flange of diaphragm. Apply thin coat of silicone
lubricant to I.D. of secondary diaphragm and raised
surfaa of flange (that fits into groove in secondary
power piston).
22. Mount Tool J 23101 (with large diameter end up)
in vise. Position secondary power piston so that radial
slots in piston fit over ears of tool. Apply light coat of
silicone lubricant to tube of secondary power piston.
23. Fold secondary diaphragm away from O.D. of
secondary support plate.
24. Holding edges of support plate, with locking
tangs
down, place secondary diaphragm and support plate
assembly over tube of secondary power piston. Flange
on I.D. of secondary diaphragm will fit into groove in
secondary piston.
25. Grip edges of secondary support plate, press down,
and rotate counterclockwise until tabs on secondary