Chevrolet 1977 10 Series, Repair Manual, Page: 169 / 468

BRAKES 5-3
M A C H I N E S L O T IN
B O T H T A N G S ON
TOOL REWORK TO ACCOMMODATE
OPTIONAL POWER PISTON DESIGN
Fig. 5 -3 A --R e w o rk o f T o o l J -2 3 101
press the air valve-push rod assembly out the bottom of the
power piston tube with a rod not exceeding 1/2" in diameter.
b. An alternate m ethod would be the use of a heavy,
Fig. 5 -4 A ~ P o s itio n in g S e c o n d a ry P o w e r P iston in T o o lJ -2 3 1 0 1
(Large Dia. End Up)
Fig. 5 -5 A -L o c k in g o r U n lo c k in g P rim a ry and S e c o n d a ry P o w e r
P isto n s
round shanked screwdriver. Insert screwdriver on both sides
of the push rod and pull the air valve-push-rod assembly
straight out. A considerable force will be required.
c. A nother m ethod requires the use of snap ring pliers.
A pproxim ately 5 /8 " from the pointed ends of the pliers, file
or saw a small slot (approxim ately 1/32" - 1/16" wide and
1/10" deep) on each half of the pliers. R ound off the pointed
ends of the pliers. Slip the slots in the pliers into tangs on the
control valve spring retainer. G rip the pliers and pull the air
valve-push rod assembly straight out.
17. Removal of the air valve-push rod assembly will
disassemble the control valve retainer.
18. Remove the "O" ring seal from the air valve.
19. Models using air valve-push rod assemblies with a
formed eye on the end of the push rod will be serviced using
a complete assembly, since the floating control valve cannot
be removed over the eye end of the push rod.
Fig. 5 -6 A --L o c k in g o r U n lo c k in g S e c o n d a ry S u p p o rt Plate and
S e c o n d a ry P o w e r Piston