Cadillac 60 Series 1963 Shop Manual page 180

BRAKES
1-15
17. Bendix Master Cylinder
Disassembly, Cleaning, Inspection
and Assembly
a. Disassembly
NOTE: If trouble has been traced to hy-
draulic system, master cylinder may be
removed from vacuum unit without removing
complete power brake assembly from car. Area
surrounding master cylinder mounting surface
must be kept clean.
1. Disconnect primary and
lines if not done previously.
secondary brake
2. Remove four nuts and lockwashers and re-
move master cylinder from vacuum power unit.
Remove seal ring and discard.
3. Remove filler caps from master cylinder
assembly.
4. Remove outlet fitting, spring, and residual
check valve from rear outlet of master cylinder,
Fig. 8-16. Remove gasket from fitting and
discard.
5. Remove snap ring from groove in bore of
master cylinder.
6. Remove primary piston and stop assembly,
secondary piston and stop assembly, secondary
spring, spring stop, secondary check valve spring,
and check valve from master cylinder housing,
Fig. 8-16.
7. Remove brass piston stop and seal assembly
from primary piston, Fig. 8-17, and discard.
Piston stop is serviced as a unit and should not
be disassembled.
8. Remove retainer, piston seal, and protector
washer from primary piston.
9. Remove retainer, piston seal, and protector
washer from forward end of secondary piston
assembly, Fig. 8-18.
10. Remove spring adjusting screw, spring
tainer, and spring from secondary piston.
r e -
Piston Stop And Seal Assembly
Piston Seal
Primary Piston
Protector Washer'
Retainer*
«i
Adjusting
Screw
y.
Springy
fc V
Spring
Piston
Seals^
(
Retainer
Seal Retainer
Protector ""^-s^^p*
W a s h e r - ^ ^ ^ ^ # \ W
*
;
*\r \
Piston
Seal
W Secondary Piston
Seal Retainer
BendfM Primary Piston pisjassembleej
Fig. 8-18 Bendix Secondary Piston Disassembled
11. Remove seal retainer and two piston seals
from secondary piston.
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. 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
piston are replaced. Throughly 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.
6. When overhauling master cylinder, use all
parts furnished in master cylinder repair kit.
c. Assembly
1. Before starting assembly of master cylinder,
dip protector washers, seals, pistons, springs,
check valves, and retainers in alcohol and place
in clean pan or on a clean paper.
NOTE: Do not handle hydraulic system parts
with greasy hands.