Cadillac 60 Series 1963 Shop Manual page 187

8-22
BRAKES
Fig. 8-30 Removing Tube Seat Insert
6. When overhauling master cylinder, use all
parts furnished in master cylinder repair kit.
c. Assembly
Be sure all parts are clean before assembling
master cylinder. Do not let grease or mineral
oil come in contact with any rubber parts.
Lubricate rubber parts with clean brake fluid
only.
1. Place master cylinder in vise with outlet
holes up and install check valve springs in outlet
holes so that they seat in depression in bottom
of holes, Fig. 8-29.
2. Install new rubber check valves over springs,
being careful not to displace springs from their
seats. When check valve is properly seated, end
of valve will be even with machined top of outlet
boss.
3. Position new brass tube inserts in outlet
holes. Thread spare brake line tube nut into each
outlet hole and turn nuts down until inserts bottom.
4. Remove tube nuts and check both outlet holes
for loose brass burrs.
5. Install new secondary seals in grooves in
counterbored end of floating piston, back-to-back,
Fig. 8-29.
6. Install new protector washer and primary
seal over end of floating piston opposite secondary
seals. Protector washer seats against flange of
piston that contains small compensating holes,
and flat side of seal seats against washer.
7. Install primary piston secondary seal in
groove on push rod end of primary piston. Lip of
seal should face toward small compensating holes
in opposite end of piston.
8. Install protector washer and primary seal
on end of master cylinder piston opposite sec-
ondary seal. Protector washer seats against
flange on piston that contains compensating holes
and flat side of seal seats against washer.
9. Position spring retainer on one end of pri-
mary piston spring and floating piston stop on
other end.
10. Install primary piston spring on primary
piston with spring retainer seated inside lips of
primary seal.
11. Compress piston spring until floating piston
stop clears small groove in end of piston. Install
small retaining ring in this groove and release
spring.
12. Coat master cylinder bore and primary and
secondary seals on floating piston with clean
brake fluid.
13. Insert floating piston, primary seal first,
into unthreaded rear end of master cylinder bore.
Push piston forward until end of piston is even
with beginning of threads for headnut.
14. Install floating piston stop bolt and new
gasket in side of master cylinder housing and
push floating piston rearward until it contacts
stop bolt. Tighten stop bolt to 10 foot-pounds
torque.
15. Place spring retainer on end of floating
piston spring and insert spring into threaded end
of master cylinder bore with retainer seated in-
side lips of floating piston primary seal.
16. Place new copper gasket on headnut and
install headnut in master cylinder, being careful
to seat floating piston spring in counterbore of
headnut. Tighten to 105 foot-pounds torque.
17. Coat primary and secondary seals on pri-
mary piston with clean brake fluid and insert
piston into master cylinder bore, spring end first.
18. Install lock ring in groove in master cyl-
inder bore.
19. Install new filter element in groove on O.D.
of master cylinder.
20. Install reservoir filler caps.
20. Brake System Testing
1. With engine running at idle and transmission
in neutral, depress brake pedal and hold foot pres-
sure on pedal. If pedal gradually falls away under
foot pressure, hydraulic system is leaking.
2. If hydraulic system is not leaking, but pedal
travels more than two inches, brake shoe adjusters