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2-24
GROUP
2-BRAKES
FIG. 24- Dual Master Cylinder
Disc Brakes
FIG. 25- Master Cylinder- Drum Brakes.
pre-adjusted and should not be
disassembled.
4. Remove
the
secondary
piston
assembly.
5. Remove the
brake
light
warn-
ing switch from the
side
of the
cylinder. Remove
the plug from the
end of the
master
cylinder
and with-
draw the
differential
valve and
spring.
INSPECTIO"'
AND
REPAIR
1.
Clean
all
parts in clean de-
natured alcohol,
and
inspect
the parts
for chipping, excessive
wear or
damage. When using a master
cylinder repair kit, install all the
parts supplied.
.
2. Check all
recesses,
openings
and internal passages
to
be
sure they
are open and free of foreign
matter.
Use
an air
hose
to
blow out dirt and
cleaning
solvent. Place all parts on a
clean
pan or
paper.
3. Inspect
the master
cylinder
bore for signs of
etching, pitting,
scoring
or rust. Honing
of the
master
cylinder
is not
recommended.
If it is
necessary
to hone the
ma~ter
cyl-
inder bore to repair
damage,
do not
exceed
allowable
hone specifications.
ASSEMBLY
1. Dip all parts
except the master
cylinder body
in clean
motorcraft
Brake
Fluid.
2. Carefully
insert the complete
secondary piston and return spring
assembly
in the master cylinder
bore.
3.
Install the
primary piston
as-
sembly in the
master cylinder
bore.
On drum brake
vehicles,
fit the
piston
retainer
plate
to the rear of
the master
cylinder and lock into
position
by
bending locking
tabs into
the
groove.
4. Depress
the
primary
piston
and insert the
secondary piston
stop
bolt
in the bottom
of the primary
reservoir.
5.
Install the
differential
valve
and
spring assembly
and refit the
plug. Do not replace the warning
light switch until the system has
been bled.
Failure to
observe
this
precaution
will result in a
damaged
switch.
6. Replace
the
diaphragm
gasket
and
the
filler cap.
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