DEMO - 1965 Ford Truck Shop Manual - ForelPublishing.com

2-64 GROUP 2-BRAKES
sembly from the body assembly by
gently tapping the body on a flat
surface.
Hydraulic Cylinder
1. Clamp the hydraulic cylinder
end cap in a vise.
2. With a wrench, loosen the hydraulic
cylinder lock nut. Unscrew
the end plate from the hydraulic cylinder.
3. Unscrew the hydraulic cylinder
from the end cap. Remove the end
cap from the vise.
End Plate
1. To disengage the push rod
from the hydraulic piston assembly,
BOOSTER PISTON RETURN SPRING
HYDRAULIC
PISTON 5A 6»
ASSEMBLY
HOOK
CLAMP
BOOSTER
p ISTON
H1029-A
FIG. 4-Push Rod Pin Removal
CONTROL
VALVE
CYLINDER
RETAINER
CONTROL VALVE
PISTON
place the booster piston assembly
over the booster return spring (Fig.
4). Compress the booster return
spring by pressing toward the end
plate to move the push rod forward.
Remove the pin retaining the hydraulic
piston to the push rod. Remove
the hydraulic piston assembly.
2. Remove the booster piston assembly,
booster return spring, and
push rod from the end plate assembly.
A hook clamp may be used to
hold the booster return spring in the
compressed position while removing
the pin (Fig. 4). The clamp should
hook through one of the holes in
the end plate and over the end of
the booster piston assembly. The
clamp should be fabricated as shown
in Fig. 4.
3. Remove the hydraulic piston
O-ring (Fig. 5). Remove the snap
ring, washer, seal retainer and
spacer, cup, fiber stop washer, and
spring from the bore of the end
plate.
4. To remove the push rod seal
and gasket from the end plate,
thread a X A inch pipe tap into the
seal. Drive the seal out from the
booster body assembly end of the
end plate using a short piece of rod
against the pipe tap. Remove the
gasket.
5. With a special tool (Fig. 5),
remove the control valve cylinder
from the end plate. Remove the seal.
6. Remove the bleeder screw. Remove
the fitting bolt and gaskets.
7. Remove the end plate from the
vise.
Control Valve Cylinder
1. Remove the retainer from the
control valve cylinder and press the
control valve piston out of the valve
cylinder.
2. Remove the two cups from
the piston.
Hydraulic Cylinder End Cap
1. Clamp the hydraulic cylinder
end cap in a vise.
2. Remove the snap ring from
the end cap. Remove the retaining
washer, spring, and check valve.
3. Remove the bleeder screw. Remove
the fitting bolt and gasket.
Booster Piston
1. To disassemble the booster piston,
use a holding fixture (Fig. 6),
to prevent damaging the piston.
2. Mount the holding fixture in a
vise and place the booster piston assembly
over the fixture.
3. Remove the packing retainer
nut. Separate the retainer, expander
ring, wick, packing retainer, and
packing leather from the top of the
piston.
ASSEMBLY
When assembling the air-hydraulic
booster, use extreme care in the
handling of the hydraulic system
parts. Do not allow any of the parts
to come in contact with mineral oil
or grease.
Booster Piston
1. To aid in the reassembly of
the booster piston, make an assem-
SNAP
RING
Booster Piston
Holding Fixture
FELT RETAINER
PACKING
RETAINER
NUT
O-RING
FIG. 5-End Plate-Disassembled
Control Valve
Cylinder Wrench
HI030-A
WICK
PACKING
RETAINER
PACKING LEATHER
BOOSTER PISTON HI 031-A
FIG. 6-Booster Piston-
Disassembled