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BRAKES-POWER-KELSEY
HAYES
5-21
W E R PISTON GUIDE
/DIAPHRAGM
P O W E R PISTON
/BLOCK
SEAL
Replace all parts that are badly scored, nicked
or
damaged. When reassembling, be sure that all rubber
parts are well lubricated with silicone grease, except
the diaphragm and the reaction ring.
Fig. 3 G R e m o v i n g or Installing the Power Piston
GUIDE SEAL
C-lllnF SFAI-
LY
AI
P (
Fig. 32-Power
Piston Guide Attaching Screws
r
NK502
Fig. 31-Removing
or Installing the Air Cleaner,
Seal and Retainer
piston, it may
be
removed by pushing on the operat-
ing rod. Do not push too far, as damage to tho
floating valve can result.
(4)
Depress tlie operating rod slightly, then remove
the truarc snap ring, using snap ring pliers (Fig. 33).
(5)
Remove the control piston by pulling the oper-
ating rod straight out of the power piston.
(6)
Remove the "0" seal ring from the end
of
the
control piston.
(7)
Remove the filter elements and dust felt from
the control piston rod.
Cleaning and Inspection
Thoroughly wash all metal parts in
a
suitable
sol-
vent and blow dry with compressed air. The power
diaphragm, plastic power piston and guide, should be
washed in a mild soap solution and water. Blow dust
and cleaning fluid out of all internal passages. All
rubber parts should be replaced, regardless of condi-
tion. Install new air filters at reassembly. Inspect all
parts for scoring, pitting, dents or nicks. Small im-
perfections can be smoothed out, using crocus cloth.
Assembly Fig.
34)
(1)
Install the control piston
"0" ring on the con-
trol piston and lubricate with silicone grease.
(2)
Lubricate the control piston assembly with sili-
cone grease and insert into the power piston. Install
the truarc snap ring in its groove, using snap ring
pliers (Fig. 33). Wipe all lubricant off the end of the
control piston.
e
P
Fig. 33-Control
Piston Snap Ring
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