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P A R T 2-3-F-250 AND F-350, AND P-SERIES BRAKE SYSTEMS
2-29
V A C U U M PISTON RETURN SPRING
HYDRAULIC CYLINDER
Hook
Chmp
H1246-A
FIG. 23—Vacuum Piston, End Plate, and Hydraulic Cylinder
clip near the opposite end of the
expander ring.
10. Assemble the retainer plate
with the cut-out portion over the
loop of the expander ring.
11. Hold the push rod in a verti-
cal position, and assemble the flat
washer over the threaded end. With
the assembly ring still in position
over the booster piston, guide the
piston assembly over the push rod.
Secure the booster piston to the push
rod with the large retaining nut.
12. Place the vacuum piston re-
turn spring over the push rod with
the small end of the spring next to
the v a c u u m piston.
13. Carefully guide the push rod
through the leather seal of the end
plate, compress the spring, and in-
stall the hook clamps to hold the
spring compressed (Fig. 23).
14. Position the hydraulic piston
on the push rod and secure with the
retainer pin. Slide the retainer spring
over the hole in the piston to hold
the retainer pin in place.
15. Carefully guide the hydraulic
cylinder over the lip of the piston
cup, and thread the hydraulic cylin-
der into the end plate, finger-tight.
R e m o v e the hook clamps and re-
m o v e the unit from the vise.
16. Hold the booster body in a
vertical position, and mount i t in a
vise at the control tube.
17. Insert a rubber stopper into
the control tube (Fig. 25).
18. With the top face of the vac-
u u m piston flush with the top edge
of the assembly ring, line up the
assembly ring with the booster body,
and guide the vacuum piston into
the booster body.
19. A s soon as the piston has en-
tered the booster body, lift the as-
sembly ring to permit inspection of
the piston packing. If the leather
packing has started to enter the
booster body without any part of the
packing folded back, remove the
rubber stopper, press the vacuum
piston into the booster body ap-
proximately 2 inches, and replace
the rubber stopper. If inspection re-
veals that any part of the piston
packing has been folded back, repeat
the above operation.
20. With the rubber stopper still
in the control line tube, slide the
assembly ring over the end plate,
as shown in Fig. 25, and remove
the rubber stopper from the con-
trol line.
21. Assemble a n e w rubber gas-
ket in the groove of the end plate,
and align the end plate with the
booster body at the scribe marks.
Install the hook bolts and tighten
uniformly (Fig. 22).
Assembly Ring
H1248-A
FIG. 24—Disassembled Vacuum Piston
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