Cadillac 60 Series 1963 Shop Manual page 183

8-18 BRAKES
Master Cylinder
Push Rod
Power
Piston
Diaphragm
Reaction
Plate
Floating Control
Valve Assembly
Floating Control
Valve Spring
Adjusting
Screw
Power Piston
Silencer
Piston Return
Spring
Special
Screw
Diaphragm
Support Plate
Air Valve and
Push Rod Assembly
Air Filter
Retainer
Fig. 8-24 Delco Moraine Power Piston Disassembled
13. Remove three reaction levers from their
seats in power piston insert.
14. Remove air valve spring from counterbore
of air valve.
15. Remove air valve and push rod assembly
from power piston.
16. Remove snubber and O-ring seal from
grooves in air valve.
17. Remove power piston insert from center of
piston.
18. Remove two O-rings from grooves in O.D.
of insert.
19. Push floating control valve assembly from
center of power piston and separate retainer, dia-
phragm, and plate from control valve.
20. Remove floating control valve spring.
21. Remove power piston diaphragm from dia-
phragm support plate. Note position of square
diaphragm lip in relation to flange on support
plate, so that new diaphragm can be installed
properly.
CAUTION: Use care when handling power
piston diaphragm to protect it from grease, oil,
foreign material, and nicks or cuts.
22. Remove master cylinder push rod from
center of support plate.
23. If necessary, reaction plate can be removed
by pressing plate off small knurled end of push
rod. Do not remove adjusting screw from end of
rod.
b. Cleaning and Inspection
1. Thoroughly wash all parts in clean alcohol,
NOTE: Use of gasoline, kerosene, anti-
freeze, or any other cleaner with even a trace
of mineral oil, will damage rubber parts.
2. Use air hose to blow out all passages, ori-
fices, and valve holes. Air dry and place cleaned
parts on clean paper or lint-free cloth.
3. If slight rust is found inside front or rear
shell, polish clean with crocus cloth or fine emery
paper, washing clean afterwards.
4. Inspect front and rear shells for scratches,
scores, pits, dents or other damage affecting roll-
ing or sealing of diaphragm or other seals. Small
imperfections may be smoothed out with fine
crocus cloth.
5. If there is any suspicion of contamination or
evidence of corrosion, completely flush car hy-
draulic system using clean brake fluid.
6. Inspect power piston diaphragm for cuts, pin
holes, distortion or cracks.
7. Inspect all other parts for distortion, dam-
age, or excessive wear and replace as necessary.
c. Assembly
Be sure all parts are clean before assembling
unit. Do not let grease or mineral oil come in
contact with any rubber parts.
Lubricate rubber parts of power piston group
with special lubricant included in service repair
kit.
1. Install power piston bearing seal in center
hole of rear shell with large flange outside, Fig.
8-22. Lubricate grooves in I.D. of bearing with
special lubricant, and install seal band over bear-
ing seal,