Chevrolet 1973 Overhaul Manual page 124

7 8 9 10
1. Rear H ou sin g M o u n tin g
Brackets (T ru ck)
2. Push R o d B o o t
3. F o am and Felt A ir
Filter-Silen cers
4. Rear H ou sing
5. Rear H ou sing Seal
6. D iaph ragm
7. A ir Valve Push R o d
A sse m b ly
Fig. 2C--Bendix Power C ylinder Com ponents (Typical)
Rear Housing Group
1. Remove the air filter element from location within
the diaphragm plate extension.
To prevent chipping o f the plastic
CAUTION:
diaphragm plate, exercise extreme caution
when removing the air filter retainer. Use a
small screwdriver or other suitable tool, and pry
at several peripheral locations until the retainer
is freed.
2. Separate the diaphragm plate assembly from the
rear housing and lay the rear housing aside.
3. Disassemble diaphragm plate assembly (fig. 2C).
a. Remove rolling diaphragm from the groove in
the diaphragm plate hub.
Care should be used in handling
CAUTION:
the diaphragm o f the diaphragm plate assem­
bly. The diaphragm should be protected from
grease, oil, foreign matter and from nicks,
scratches and gouges.
11 12 13 14
A ir V alve L o c k
8.
D iap hragm Plate
9.
R eaction D isc
10.
Piston R o d
11.
D iap hragm R etu rn
12.
Sp rin g
F ro n t H o u sin g
13.
F ro n t H o u sin g Seal
14.
G ro m m e t
15.
C heck V alve
16.
b. Hold the diaphragm plate so that the push rod
is in its normal (horizontal) installed position,
depress the push rod slightly (approximately
1/16 inch), and rotate piston so the air valve
lock will fall from its location in the diaphragm
plate hub. Remove the air valve push rod
assembly from the diaphragm plate. Remove
the reaction disc from its location in the
diaphragm plate bore (insert the piston rod or
other suitable tool through diaphragm plate
extension and push disc from its seat). Exercise
care so as not to chip surface of passages in the
diaphragm plate.
NOTE: Perform Step 4 only if seal is
defective and a new seal is available. Do not
reuse seal once it has been removed from the
unit.
4. Support outer surface of rear housing on blocks of
wood or other suitable material (stud side up) and
drive out seal with a punch or a thin blade
screwdriver. Discard seal.
Front Housing Group
1. Remove check valve from grommet; then remove
grommet from front housing.
2. Remove front housing and holding fixture from
vise; then remove holding fixture from front
housing.
Cleaning
Use denatured alcohol to clean all metal, plastic and
rubber parts of the power cylinder. Immerse parts in
cleaning solvent 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 follow with a thorough cleaning as
outlined above.
BRAKES 5-21
OVERHAUL MANUAL