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5-10
BRAKES-SERVICE
Ins falluf ion
(1) Install the master cylinder on the dash panel
and fill with brake fluid. Tighten nuts to 100 inch
pounds.
(2) Attach the brake line and the pedal push rod.
(3) Bleed the brake system as described previously.
WHEEL CYLINDER SERVICING
With all the brake drums removed inspect the wheel
cylinder boots for evidence of a brake fluid leak. (A
slight amount of fluid on the boot may not be a leak,
but may be preservative oil used on the assembly.)
(1) In the case of a leak, remove the brake shoes
(replace if soaked with grease or brake fluid), boots,
piston wheel cylinder cups and wheel cylinder cup
expansion spring.
(2) Wash the wheel cylinder bore with clean brake
fluid and inspect for scoring or pitting.
Use extreme care in cleaning the wheel cylinder
after reconditioning. Remove all dust or grit by flush-
ing the cylinder with alcohol; Wipe dry with a clean
lintless cloth and clean a second time with alcohol.
Dry the wheel cylinder with air pressure, then flush
with clean brake fluid. (Be sure the bleeder screw port
and the bleeder screw are clean and open.)
Wheel cylinder bores or pistons that are badly
scored or corroded should be replaced. The old piston
cups should be discarded when reconditioning the
wheel cylinders.
Cylinder walls that have light scratches, or show
signs of corrosion, can usually be cleaned with crocus
cloth, using a circular motion. However, cylinders that
PUSH 'ROD
BOOT
PISTON
\
have deep scratches
or
scoring may be honed, using
Tool C-3080, providing the diameter of the cylinder
bore is not increased more than .002 inch.
NOTE: A
cylinder that does not clean up to
.002
inch should be discarded and
a new cylinder in-
stalled. Black stains in the cylinder walls are caused
by the piston cups and will do no harm.
Should inspection reveal the necessity of installing
a new wheel cylinder (front or rear), proceed as fol-
lows:
(1) Disconnect the brake hose from the brake tube
at the frame bracket (front wheels) or, disconnect the
brake tube from the wheel cylinder (rear wheels).
(2) Disconnect the brake hose from the wheel cylin-
der (front wheels only) and remove the wheel cylin-
der attaching bolts, then slide the wheel cylinder out
of the support.
Disassembly
If the wheel cylinders were not disassembled before
removal, refer to Figure 11, then proceed as fol-
lows:
(1) Remove the boots and push rods.
(2) Press
in
on one end
of
the cylinder and force
out the piston, cup, piston spring, cup and piston.
Assembly
(Fig. 7 71
NOTE:
Before assembling the pistons and new cups
in the wheel cylinder, dip them in brake fluid. If
the boots are deteriorated, cracked or do not fit
tightly on the brake shoe push rod, as well as the
wheel cylinder casting, new boots should be in-
stalled.
BRAKE CYLINDER-FRONT
1
HOUSING
\
~ D . S C R E W
\ \
\
BLEED SCREW'
.-
.
BRAKE CYLINDER-REAR
Fig.
I I-Wheel
Cylinder
Assembly (front
and
read
NK506
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