Chevrolet Chevelle 1977 Repair Manual page 181

POWER PISTO
Fig. 5-7C --R em oving R eaction R etainer
5. Place power piston W rench J-21524 with square
shank in vise. Hold support plate and power piston with tube
of power piston up (fig. 5-8C).
6. Pull diaphragm edges away from support plate so
hands can grip steel support plate. Position assembly on
power piston W rench J-21524 so three lugs on tool fit into
three notches in power piston (fig. 5-9C).
7. Press down on
counterclockwise until support plate separates from power
piston (fig. 5-IOC).
SUPPORT PLATE
\
Fig. 5-8C--Positioning S upport Plate Retainer in Vise
REACTION
RETAINER
REACTION
LEVERS
REACTION
PLATE
support plate and rotate
----- D IAPHRAG M
s -
BRAKES
Fig. 5 -9 C -P o s itio n in g P o w e r P iston on S u p p o rt Plate R em over
8. Remove diaphragm from support plate and lay both
parts aside.
9. Position power piston, tube down, in a tool, fabricated
from a piece of wood
in center, clamped in a vise. Do not clamp tube in vise.
10. Use Snap Ring Pliers J-4880 to remove snap ring on
air valve (fig. 5-11C).
11. Set up Power Ram and H ydraulic Pum p with J-9746
Press Plate. Insert power piston, tube down, in press plate
and remove air valve assembly using a 3/8" drive extension
as a remover (fig. 5-12C).
12. Removal of air valve-push rod assembly disassembles
the following parts from power piston: floating control valve
assembly, floating valve retainer, push rod limiter washer and
air filter.
Fig. 5-10C--Removing S upport Plate
2"
x 4" x 8" long with a 1-3/8" hole
SUPPORT
PLATE
PISTON
SUPPORT PLATE
REMOVER A N D
INSTALLER J-21524
5-15