PART
2-2
-BRAKE SYSTEM
and no further grinding is re-
quired.
4.
Check the clearance between
the shoe and lining. The lining must
seat tightly against the shoe with not
more than
.005 inch clearance be-
tween any two rivets.
MAS'CER CYLINDER
DISASSEMBLY
1.
Clean the outside of the cylin-
der, and remove the filler cap and
gasket. Pour out any remaining fluid.
2.
Remove the stop light switch,
brake fitting, and gaskets (Fig. 16).
3.
Remove the snap ring from the
push rod end of the cylinder.
4.
Remove the piston, cup, spring,
valve assembly, and valve seat.
5.
Remove the rubber bumper
from the piston.
MASTER CYLINDER ASSEMBLY
1.
Dip all parts except the cylinder
body in clean
heavy-duty
brake
fluid.
2.
Install the brake fitting (Fig.
16) on the forward end of the
cylinder.
3.
Thread the stop light switch into
the cylinder and tighten it securely.
4.
Insert the valve seat, valve and
spring assembly, cup, and piston into
the cylinder bore.
5.
Compress the piston against the
valve spring and install the snap
ring.
6.
Install the rubber bumper in
the piston (standard brakes only).
MASTER CYLINDER
INSPECTION AND REPAIR
1.
Clean all parts in clean dena-
tured alcohol and inspect the parts
for wear or damage, replacing them
as required. When using a master
cylinder repair kit, install all of the
parts supplied.
2.
Check all openings to be sure
they are open and free from foreign
matter.
3.
Check the spring valve at the
forward end of the piston. If the
spring is loose or has moved so that
the piston ports are open, replace
the piston.
4.
Inspect the cylinder bore for
score marks or rust.
If either condi-
SHELL
H1333-A
FIG.
1
7-Vacuum Booster
tion is present, the cylinder should
be honed. When honing,
do not re-
move more than
0.003
inch as
oversize parts are not available.
5.
Remove any burrs or loose
metal that may have resulted from
honing. Then clean the cylinder with
denatured alcohol.
DISASSEMBLY OF BOOSTER
1.
Remove the speed nuts that
attach the mounting plate (Fig. 17)
to the rear shell and remove the
plate.
2.
Pull the push rod and front seal
(Fig. 18) from the front shell.
3.
Scribe an index mark across the
front and rear shells.
4.
Place the booster in a vise as
shown in Fig. 20. Press downward
on the rear shell and at the same
time, turn it counterclockwise with
a flat bar to release it from the front
shell. Release the pressure on the
rear shell slowly to prevent the
diaphragm plate return spring from
flying out.
5.
Separate the two shells and re-
move the return spring.
6.
Withdraw the diaphragm plate
and diaphragm from the front shell.
7.
Remove the diaphragm from
the diaphragm plate as shown in
Fig. 21.
8. Pry the filter retainer off the
diaphragm plate being careful not to
chip or damage the plate.
9.
Hold the diaphragm plate so
that the valve retainer is facing
downward. Press the valve push rod
inward to release the tension on the
retainer and allow it to drop out of
the plate (Fig. 22).
10.
Withdraw the valve and rod
from the plate.
11.
Press the reaction disc out of
the diaphragm plate.
12.
Pry the seal retainer (Fig. 19)
out of the rear shell.
13.
Lift the bearing and the seal
from the rear shell.
14.
Working from the inside of
the front shell, cut the bead off the
check valve grommet. Remove the
check valve.
PUSH
ROD
FIG.
1
8-Removing
Front Seal and Push Rod
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