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P A R T 2-3-F-250 AND F-350, AND P-SERIES BRAKE SYSTEMS
2-33
VALVE BODY COVER-
8'A INCH UNITS
Mo
VALVE BODY
W^\
COVER
GASKET
CONTROL VALVE BODY
RETAINING PLATE
END PLUG
GASKET ,
• BODY
PUSH ROD
COLLAR
SPRING AND PUSH-ROD PARTS-
8 % INCH UNITS
FIG. 32—Frame-Mounted—Diaphragm Type—Disassembled
parts can be assembled in their origi-
nal positions.
3. Carefully
remove
the body
clamp. Then remove the rear body
and the diaphragm with the return
spring.
4. R e m o v e the push rod, spring
retainer and collar from the coils of
the return spring.
5. R e m o v e the valve body cover
and gasket. Scribe a line on the side
of the valve body cover and valve
body.
6. R e m o v e the valve body, spring,
and the piston and diaphragm assem-
bly from the slave cylinder body.
7. R e m o v e the end plug, copper
gasket, spring (and spring seat, on
frame
mounted
units) and spring
retainer from the end of the slave
cylinder.
8. R e m o v e the piston cup and hy-
draulic piston assembly from the cyl-
inder. If the assembly does not fall
free of the cylinder bore i t m a y be
pushed out by inserting the push rod
in the bushing.
9. R e m o v e the check valve retain-
er, check valve and return spring
from the hydraulic piston.
10. M o u n t the slave cylinder body
in a vise and remove the push rod
bushing, lockwasher and front body
from the slave cylinder body.
11. R e m o v e
the gasket, rubber
seal and transfer bushing from the
slave cylinder body. R e m o v e the 2
push rod bushing snap rings, and re-
m o v e the washer and 2 seals from
the bushing. R e m o v e the " O " ring
seal from the outside diameter of the
push rod bushing.
12. R e m o v e
the seal from the
lower end of the control valve piston.
R e m o v e the seal from the piston boss.
13. R e m o v e the retainer nut from
the piston boss by prying the inner
tangs of the nut away from the boss,
and remove the diaphragm plate and
control valve diaphragm.
14. R e m o v e
the screw,
lock-
washer, spacer, spring, disc and seal
from the control valve body.
INSPECTION
W a s h all metal parts in solvent.
Wipe them thoroughly with clean
rags and use compressed air to dry
all internal passages. W a s h all rubber
parts in alcohol or brake fluid.
Replace
all worn
or damaged
parts. If the hydraulic piston or the
control valve piston bores in the
slave cylinder are worn or corroded,
the slave cylinder body should be re-
placed. T h e push rod must be per-
fectly smooth, to avoid leaks at the
seal, and should be replaced i f i t i s
rough or damaged.
Replace the control valve dia-
phragm, all rubber cups and seals,
and springs. If the control valve pis-
ton boss seat (in the control valve
body) i s damaged, replace the body.
Clean the hydraulic piston assem-
bly thoroughly, to ensure proper ap-
plication and release of the check
valve. It should not be necessary to
replace the hydraulic piston assem-
bly unless a definite leak is evident
before disassembly. If brake fluid is
leaking from the slave cylinder, re-
place the hydraulic piston assembly,
piston cup, control valve piston as-
sembly, and piston seal. Also replace
the gasket and seal on the front body
assembly end of the slave cylinder.
ASSEMBLY
1. Position a n e w seal in the con-
trol valve body. Assemble the spring,
and spacer in the valve body and se-
cure with the screw and lockwasher.
Tighten the screw securely.
2. Position the control valve dia-
phragm and plate and secure i t in
place with the retainer nut.
3. Install the control valve piston
seal on the piston.
4. Insert the check valve spring,
valve, and retainer in the hydraulic
piston. Be sure the check valve floats
freely and does not bind in the bore.
5. Install the transfer bushing,
rubber seal and gasket on the front
body end of the slave cylinder body.
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