Installing Control Valve And Retainer; Gaging Reaction Piston; Installing Snap Ring On Air Valve - Pontiac Grand Prix Service Manual

5D-6
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PONTIAC SERVICE MANUAL
PISTON
Fig. 5D-9 Installing Control Valve and Retainer
valve starts into its bore. Push the control valve
assembly into the tube so that the complete control
valve is just inside the tube.
4. Insert control valve retainer over end of control
valve so that closed side of retainer rests against
control valve.
5. Installet tool J 23175 fits the I.D. of the floating
control valve retainer. Push floating control valve
assembly to its seat in tube of power piston (Fig.5D-
9).
6. Place pushrod limiter washer over pushrod and
position against floating control valve retainer.
Fig. 50-10 Installing Snap Ring on Air Valve
POWER PISTON GAGING
REMOVE RUBBER REACTION DISC, PISTON
ROD RETAINER
8
AIR VALVE
SPRING FOR G A G I N G
SECONDARY
CORRECT
AIR VALVE-PUSH G O INCORRECT
ROD ASSEMBLY
(REACTION (REACTION
PISTON PISTON
TOO SHORT) TOO LONG)
Fig. 5D-11 Gaging Reaction Piston
7. Stretch the foam filter element over pushrod eye
and press into primary power piston tube.
8. Using Truarc No. 2 pliers, place the retaining ring
into groove on air valve. (Fig. 5D- 10)
9. Position the rubber reaction bumper on end of air
valve.
NOTE: Tolerances of the component parts affecting
output of the tandem power brake are very critical. In
order to maintain correct power brake output, the power
piston assembly must be gaged for selective
j t
of
reaction piston whenever the primary power piston
andor secondary power piston are replaced during
servicing. This gaging operation is not required if if
neither power piston is replaced during servicing.
10. The gaging procedure is to be performed as
follows: (Fig. 5D- 1 1)
a. Hand-tighten the secondary k w e r plsbn to the
primary power piston without installing the air valve
spring. (The air valve-pushrod assembly should be
secured to the primary power piston as described in
step #8.)
b. Insert the reaction piston into its cavity in the
secondary power piston. This is accoknplished by