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5- 1 2 BRAKES
Figure 21-Positioning Housing Divider Over Secondary Bearing
Protector Tool J-23188
21 . Apply a light coat of talcum powder or
Delco Silicone Lube #5459912 (or equivalent)
to the bead on the outs.ide diameter of the
secondary
diaphragm .
This will
faciltate
reassembly of front and rear housings.
22 . Hold the housing divider so that the
formed over flange (that holds the primary
diaphragm) of the divider faces down .
Place
the secondary bearing in the inside diameter of
the divider so that the extended lip of the
bearing faces up .
23 . Lubricate the inside diameter of the
secondary bearing with Delco Silicone Lube
#5459912 (or equivalent).
24 . Position
secondary
Bearing
Protector
Tool J-23188 on the threaded end of the
secondary power piston (figure 21).
25 . Hold the housing divider so that the six
oblong protrusions on the middle of the divider
are facing up. Press the divider down over the
tool and onto the secondary power piston tube
where
it
will rest
against
the diaphragm
support ring .
Remove Tool J-23188 from
secondary
power
piston ;
however, do
not
remove
the
secondary
power
piston
sub-
assembly from Tool J-23101.
26 . Pick
up
the
primary
power
piston
assembly and fold the primary diaphragm away
from the outside diameter of the primary
support plate .
27 . Position the small end of the air valve
return spring on the air valve so that it
contacts the air valve retaining ring .
Figure 22-Gauging Piston Rod
28 . Position the primary power piston on the
tubular portion of the secondary power piston,
making sure that the air valve return spring
seats down over the raised center section of
the secondary power piston .
29 . Grip the edge of the, primary support
plate, press down, and start the threads on the
secondary
power
piston
into the threaded
portion of the primary power piston by rotat-
ing in clockwise direction (figure 12).
30 . Continue to tighten the primary power
piston until it is securely attached (approx-
imately 5-15ft . lbs.) to the secondary power
piston .
31 . Fold the primary diaphragm back into
position on the primary support plate and pull
the
diaphragm
outside
diameter
over
the
formed flange of the housing divider.
Check
that the bead on the diaphragm is seated
evenly around the complete circumference .
32 . Wipe a thin film of Delco Silicone Lube
#5459912 (or equivianet) on the outside dia-
meter of the piston rod retainer.
Insert the
master cylinder piston rod so that the flat enc
bottoms against the rubber reaction disc
in
the
bottom of the cavity .
Rear Housing, Group
1 . Coat the inside diameter of the rear
housing
seal
with
Delco
Silicone
Lube
#5459912 (or equivalent).
2 . Place the NEW seal in the rear housing
center hole so that the formed flange of the
housing center hole fits into the groove of the
seal. The thin lip of the seal will protrude to
the outside of the housing.
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