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5- 1 0 BRAKES
Figure 19-Installing Floating Control Valve Retainer with
Installer J-23175
CLEANING
Use denatured alcohol to clean all metal,
plastic and rubber parts of the pawer cylinder.
Immerse parts in cleaning fluid and use a hair
brush to remove foreign matter. Blow out all
passages, orifices and valve holes.
AIR DRY
and place cleaned parts on clean paper or lint-
free cloth .
If slight rust is found on inside
surface of power cylinder housing, polish clean
with crocus cloth or fine emery cloth, then
Figure 20-Seating Floating Control Valve with Installer J-23175
CAUTION: Use of gasoline, kerosene,
antifreeze alcohol or any other cleaner
with even a trace of mineral oil, will
damage rubber parts .
ASSEMBLY
CAUTION :
Be sure to keep parts clean
until
reassembly .
Re-wash
at
reassembly if there is any occasion to
doubt
cleanliness
-
such
as parts
dropped or left exposed for eight hours
or longer .
If you
suspect there
is
any con-
tamination
or
any
evidence
of
corrosion, completely flush the vehicle
hydraulic brake system in accordance
with the Maintenance Manual .
Lubricate rubber, plastic and metal
friction points with Delco Silicone Lube
#5459912 (or equivalent) .
follow with a thorough cleaning as outlined
above.
INSPECTION
Wipe cleaning fluid from all parts and care-
fully inspect each part for damage and wear.
Inspect rubber parts for cuts, nicks and dis-
tortion.
These rubber parts are the key to,
control of air flow and should account for the
majority of troubles traceable to leakage .
If
there is any question whatever as to service-
ability of any part, replace it .
Refer to "Inspection Chart" (figure 18) for
more detailed instructions .
Front Housing Group
1. Replace vacuum check valve using a new
grommet if old one is cracked or damaged.
2 . Place new front housing seal in housing
so flat surface of cup lies against bottom of
depression in housing .
Power Piston Group
1 . Lubricate
the
inside
diameter
and
outside diameters of the "O" ring seal with
Delco Silicone Lube #5459912 (or equivalent)
and place on the air valve .
2 . Wipe a thin film of Delco Silicone Lube
#5459912 (or equivalent) on the large and
small outside diameter of the floating control
valve.
NOTE :
If the floating control valve needs
replacement, it will be necessary to replace
the complete air valve-push rod assembly .
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