Cadillac 60 Series 1963 Shop Manual page 181

8-16
BRAKES
2. Dip two piston seals in brake fluid and install
seals on spring end of secondary piston with seals
back-to-back, Fig. 8-18. Install retainer on outer
seal.
3. Stand piston on end opposite seals and install
spring and spring retainer.
4. Install spring adjusting screw in bottom of
spring retainer and start screw into piston body
by exerting enough pressure on screw driver to
compress spring and engage threads.
5. Tighten spring adjusting screw until meas-
urement from end of spring retainer to surface
against which protector washer seats, is 3-35/64
inches, as shown in Fig. 8-19. To measure this
distance accurately, place piston on a flat surface
with spring retainer down and, using a steel scale
graduated in sixty-fourths of an inch, measure
upward from end of retainer.
CAUTION: If screw is turned in too far,
piston will cover master cylinder inlet port,
resulting in excessive brake pedal travel before
brakes apply. If screw is not turned in far
enough, piston will cover by-pass hole in
master cylinder, and pressure build-up will
cause brake drag.
6. Install protector washer, seal, and retainer
on end of secondary piston.
7. Coat inside bore of master cylinder with
brake fluid and dip secondary piston and seals in
brake fluid.
Protector
Washer Seat
Spring
SV
;
^**Retainer
Master Cylinder Shaft
Seal Installer J-9719-01
1
Piston Stop and Seal Assembl
Fig. 8-20 Installing Piston Stop And Seal Assembly
8. Stack secondary piston assembly, secondary
spring with small diameter end of spring next to
piston, and spring stop, Fig. 8-16.
9. Insert check valve spring in recessed end of
check valve and place these parts on spring stop.
Carefully guide this group of parts into master
cylinder.
10. Dip primary piston and piston stop and seal
assembly in brake fluid and, using Master Cylin-
der Shaft Seal Installer, J-9719-01, Fig. 8-20, in-
stall new piston stop and seal assembly over end
of primary piston with undercut end of stop toward
primary seal end of piston.
11. Install protector washer, piston seal, and
retainer on primary piston with lip of seal toward
retainer.
12. Dip entire assembly in brake fluid and guide
into position in cylinder bore. Install snap ring in
ring groove.
NOTE: Undercut on brass piston stop and
seal assembly should not be visible.
13. Dip residual check valve in brake fluid. In-
sert spring in recessed end of check valve and
install valve and spring in rear outlet of master
cylinder, Fig. 8-16.
14. Place new gasket on outlet fitting and install
fitting in master cylinder.
Fig. 8-19 Secondary Piston Spring Adjustment
15. Install filler caps in master cylinder.