Power Piston - Install - Pontiac Grand Prix Service Manual

5A-6 1969
PONTIAC SERVICE MANUAL
MASTER
CYLINDER
ASSEMBLY
BEARING
b
Fig. 5A-6 Exploded View of Firebird, Grand Prix and
Tempest Power Brake Unit
16.
Install air valve spring retainer so it seats on snap
ring and assemble reaction bumper into groove in end
of air valve.
17. Position reaction spring on spring retainer.
18. Position three reaction levers in slots on power
piston. Narrow ends will rest on reaction spring.
19.
Position reaction plate, with numbered side up, on
top of reaction levers and press down on plate until
large ends of reaction levers pop up and plate rests flat
on levers. Be sure that reaction plate is centered.
NOTE: Lock ring is positioned around power piston so
that it goes alternately over ear of reaction retainer and
under lug of power piston until end of ring
is
seated
under lug with raised divider.
CAUTION: Make sure that both en& of lock ring are
securely under large lug.
22.
Remove power piston assembly from vise. Install
large foam air filter ring over neck of power piston
hub.
20.
Place small end of hydraulic push rod in hole in
POWER PISTON
-
INSTALL
center of reaction plate and line up ears on reaction
retainer with notches in power piston and push 1. Place new power piston bearing in center of rear
reaction retainer down until ears seat in notches. housing so that flange on center hole of housing fits
into groove of power piston bearing. Large flange on
21. Maintain pressure on reaction retainer and position
power piston bearing will be on stud side of housing.
large lock ring down over master cylinder push rod so
that one end of lock ring goes under lug on power 2.
Liberally coat inside of power piston bearing with
piston raised divider. power brake lube.