Cadillac 60 Series 1963 Shop Manual page 182

BRAKES
8-17
Power Unit
Shell Separator J-9504
Rear Shell
Fig. 8-21 Removing Delco Moraine Power Unit Rear Shell
18. Delco Moraine Power Brake Unit
Disassembly, Cleaning, Inspection
and Assembly
a. Disassembly
1. Scribe a line on top center of front and rear
shells of power unit in line with master cylinder
filler caps.
Support
Plate Seal
Support Plate
Seal Retainer
G a s
,
k e t
Fig. 8-23 Support Plate Seal Retainer Disassembled
6. Pull push rod through dust guard on rear
shell and remove air filter and retainer from
hollow tube surrounding push rod.
7. Remove dust guard, seal band, and power
piston bearing seal from center hole in rear shell.
Remove silencer from dust guard.
2. Place assembly in bench vise with rear shell
up and tighten vise jaws securely on master cylin-
der, being careful not to crack casting.
3. Install Power Unit Shell Separator, J-9504,
over mounting studs on rear shell. Apply a slight
downward pressure and rotate rear shell counter-
clockwise until it disengages from front shell,
Fig. 8-21.
CAUTION: Be careful when removing Sepa-
rator Tool as internal piston return spring may
cause rear shell to fly off when pressure is
released.
8. Remove front shell and master cylinder from
vise and remove vacuum check valve and
grommet.
9. Remove two nuts and lockwashers that retain
master cylinder to front shell and remove master
cylinder.
10. Remove support plate seal retainer from
center of front shell and remove seal from re-
tainer, Fig. 8-23.
11. Remove gasket from O.D. of retainer.
4. Pump push rod three or four times to re-
lieve residual vacuum in power unit.
5. Remove rear shell, power piston assembly,
and piston return spring, Fig. 8-22.
12. With master cylinder push rod up, remove
three special hex head screws from power piston
and lift master cylinder push rod and diaphragm
support plate assembly from power piston as-
sembly, Fig. 8-24.
itwi
Silencer
Rear Shell
Power Piston
Assembly
Bearing
Seal
Front Shell
Piston Return
Spring
Grommet
Vacuum
Check
Valve Master
Cylinder
Support Plate
Seal Retainer
Nut
Fig. 8-22 Delco Moraine Power Unit Disassembled