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BRAKES
REPAIRS
8-21
Figure 8-14-Masler Cylinder-Disassembled
8-19 BRAKE MASTER CYLINDER
OVERHAUL
nished in the master
cylinder
r
epair kit,
(Group 4.6
49).
5. Thoroughly clean all other parts
with
De-
clene Flushing Fluid, hydraulic brake fluid, or
a good grade of alcohol. CAUTION
:
Do not
use
gasoline,
kero
sene ,
or any
other cleaning
fluid that
might
contain even a
tra ce
of
min-
eral
oil.
6. Inspect cylinder
barrel
for scores, deep
scratches,
or corrosion. Light
scratches
and
slightly
corroded spots in cylinder barrel may
be polished
with
crocus cloth. Do not
use
emery
cloth or eamd/ptuper.
If
scratches
or corroded
spots are too
deep
to be
polished
satisfactorily
with crocus cloth the cylinder should be re-
placed since honing is
not
r
ecommended
and
oversize
pistons and cups are not furnished for
service.
7.
Make
certain that com pen sating
port in
cylinder
is
clear;
how
ev er ,
do not
ru
n a
w
ire
through port
as
this may
re
sult in
leaving
a
burr w
hich
w
ill cut a groove in
primary
cup.
8. Install stop plate, lock ring, push rod and
boot.
Dip internal parts in brake fluid
,
then in-
stall piston with secondary cup, primary cup,
spring with retainer against primary cup,
check valve, and head nut with rubber washer
and gasket. Tighten head nut securely. Install
filler cap nut and gasket to keep dirt out of
reservoir.
See
figure
8-14.
9. Install master cylinder on frame side rail.
Connect brake pipe. Connect master cylinder
push rods and adjust brake pedal for proper
clearance (par. 8-11).
10. Flush and bleed hydraulic system (par.
8-10) .
11. Remove car jacks and road test car for
brake performance (par. 8-5 and 8-6).
HEAD NUT
1
0:;;:,71
.
. . .
u
~,
~
CYLINDER BODY
~)
STOP PLATE
-
1. Jack up both ends of car in a safe manner.
2. Disconnect master cylinder inner and
outer push rods at pedal adjusting nut (fig.
8-8). Disconnect brake pipe from master cylin-
der and tape end of pipe to prevent entrance of
dirt.
Remove
master cylinder from frame side
rail.
3. Remove filler cap nut and drain all fluid
from master cylinder. Remove head nut, check
valve, and spring. Turn the boot back, remove
lock ring, then remove push rod, stop plate,
piston, and primary
cup.
See figure 8-14.
Discard head nut gasket and washer, check
valve, spring and retainer, piston and rubber
cups, lock ring, and boot. These parts are fur-
9.
Adjust brakes (par. 8-12) then road test
car for brake performance (par. 8-5 and 8-6).
FILLER CAP N U T -
GA
SKET
- - - - .
~
(""'"
LOCK RING
1
BOOT
7-
~
J
~
r
/
USH
R~
~
(f",
,
~,R~~G
& RETAINER
!
,
~-
'I
I
I
.
~ C~ ~vVJJJJ
c-.
SECONDARY
CUP~TON
l
PRIMARY CUP
CHECK~ALV?J
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