Cadillac 60 Series 1963 Shop Manual page 186

BRAKES
5-21
1. Disconnect primary and secondary brake
lines, if not done previously.
2. Remove two nuts and lockwashers and r e -
move master cylinder from vacuum power unit.
3. Remove filter from groove on O.D. of open
end of master cylinder, Fig. 8-29.
4. Remove floating piston stop bolt and gasket
from boss between outlet holes on side of master
cylinder.
5. Remove headnut and gasket from master
cylinder housing and remove floating piston spring
and retainer.
6. Remove lock ring from open end of master
cylinder and remove primary piston assembly.
7. Push floating piston out of unthreaded rear
end of master cylinder bore.
8. Remove filler caps from fluid reservoirs.
9. Place master cylinder in vise with outlet
holes up.
10. Install a spare brake line tube nut in outlet
hole, Fig. 8-30. Place flat washer on 1 inch #8-32
screw and thread screw into threaded hole in tube
seat insert.
NOTE: Before installing screw, run a #8-32
tap into hole to clean up threads.
11. To pull insert, hold screw from turning and
turn tube nut out of outlet hole, Fig. 8-30. Re-
move both inserts in this manner and discard.
12. From cavity beneath each tube insert, r e -
move rubber check valve and check valve spring,
Fig. 8-29.
13. Remove primary seal, protector washer,
and secondary seals from floating piston.
14. Compress primary piston spring, attached
to primary piston, remove small retainer ring
from groove in end of piston, and remove piston
spring and floating piston stop.
15. Remove spring retainer, primary seal, pro-
tector washer, and secondary seal from primary
piston.
b. Cleaning and Inspection
1. Thoroughly wash all parts in clean alcohol.
NOTE: Use of gasoline, kerosene, antifreeze,
or any other cleaner with even a trace of min-
eral 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. Inspect master cylinder bore for scoring,
rust, pitting or etching. Any of these will require
replacement of master cylinder housing.
4. Inspect master cylinder pistons for scoring,
pitting or distortion. Any of these will require
replacement of piston.
NOTE: If either master cylinder housing or
pistons are replaced, thoroughly clean new
parts with alcohol and blow out all passages
with air hose.
5. Examine fluid reservoirs for foreign matter
and check all passages for restrictions. If there
is any suspicion of contamination or evidence of
corrosion, completely flush car hydraulic system
using clean brake fluid.
Filter
Floating
Piston
Spring
Secondary
Seal
Filler Caps
/ \ . Headnut
Gasket
Fig. 8-29 Delco Moraine Master Cylinder Disassembled