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5-8 BRAKES
Figure 14-Removing Reaction Piston and Reaction Disc from
Secondary Power Piston
piston so that the two radial slots in the piston
fit over the ears (tangs) of the tool (figure15) .
11 . Fold back primary diaphragm from the
support plate .
Grip the edge of the support
plate and rotate in a counterclockwise direct-
ion to unlock the primary support plate from
the primary power piston (figure 16).
12 . Remove the primary diaphragm from the
primary support plate .
13 . Remove the air filter from the tubular
section of the primary power piston .
14 . Remove the power head silencer from
the neck of the power piston tube .
Figure 15-Positioning Primary Power Piston in Tool J-23101
(Small Dia . End Up)
Figure 16 -Locking or Unlocking Primary Support Plate from
Primary Power Piston
15 . Remove
the rubber reaction bumper
from the end of the air valve .
16 . Using snap ring pliers J-4880, remove the
retaining ring from the air valve (figure 17) .
17 . Remove the air valve-push rod assembly
from the tube end of the primary power piston .
The following removal method is recommended :
Place the primary power piston in an arbor
press and press the air valve push rod assembly
out the bottom of the power piston tube with a
rod not exceeding 1/2" in diameter.
18 . Removal of air valve push rod assembly
will disassemble control valve retainer .
19 . Remove "O" ring seal from air valve .
Figure 17-Removing Retaining Ring
from Air Valve
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