GROUP
2-BRAKES
FIG. 3-Push Rod
Adiustment
system has been disconnected for
repair or replacement air may enter
the system and cause spongy pedal
action. Bleed the hydraulic system
after it has been properly connected
to be sure that all air is expelled.
The hydraulic system can be bled
manually or with pressure bleeding
equipment.
MANUAL BLEEDING
Bleed the longest lines first. Keep
the master cylinder reservoir filled
with new heavy-duty brake fluid
during the bleeding operation.
Never use brake fluid which has
been drained from the hydraulic
system.
1.
Position a suitable %-inch box
wrench (Fig.
4)
on the bleeder fit-
APPROXIMATELY
45'
\
FIG. 4-Wrench for
Bleeding Brake
ting on the right rear brake wheel
cylinder. Attach a rubber drain tube
to the bleeder fitting.
The end of the
tube should fit snugly around the
bleeder fitting.
2.
Submerge the free end of the
tube in a container partially filled
with clean brake fluid, and loosen
the bleeder fitting approximately
J/4
turn.
3.
Push the brake pedal down
slowly thru its full travel. Close the
bleeder fitting, then return the pedal
to the fully-released position. Repeat
this operation until air bubbles cease
to appear at the submerged end of
the bleeder tube.
4.
When the fluid is completely
free of air bubbles, close the bleeder
fitting and remove the bleeder tube.
5.
Repeat this procedure at each
brake wheel cylinder in the following
order: left rear, right front, and left
front. Refill the master cylinder reser-
voir after each wheel cylinder is bled
and when the bleeding operation is
completed. The fluid level should be
within
%
inch from the top of the
reservoir.
PRESSURE BLEEDING
Bleed the longest lines first.
Never
use brake fluid which has been
drained from the hydraulic system.
The bleeder tank should contain
CLEANING AND INSPECTION
BRAKE ASSEMBLY
1.
Remove the wheel from the
drum, then remove the drum as out-
lined in Part
2-2,
Section
2.
Wash
all the parts except the brake shoes
in a cleaning fluid and dry them with
compressed air.
2.
Brush all dust from the backing
plates and the interior of the brake
drums.
3.
Inspect the brake shoes for ex-
cessive lining wear or shoe damage.
If the lining is worn to within
%z
inch of any rivet head or if the shoes
are damaged, they must be replaced.
Replace any lining that has been oil
saturated. Replace lining in axle
sets. Prior to replacement of lining,
the drum diameter should be checked
to determine if oversize linings must
be installed.
4.
Check the condition of the
brake shoes, retracting springs, and
drum for signs of overheating. If the
springs show any loss of load or
change in free length, indicating
overheating, replacement of the re-
enough new heavy-duty brake fluid
to complete the bleeding operation,
and it should be charged with
10-30
pounds of air pressure.
1.
Clean all dirt from the master
cylinder reservoir cap.
2.
Remove the master cylinder
reservoir cap, install
an
adapter cap
to the reservoir, and attach the
bleeder tank hose to the fitting on
the adapter cap. An adapter cap can
be fabricated by cutting a hole in
the center of a filler cap and solder-
ing a right angle fitting in the hole.
A right angle fitting must be used
on power brakes to provide clear-
ance at the body brace.
3.
Position a %-inch box wrench
(Fig.
4)
on the bleeder fitting on
the right rear brake wheel cylinder.
Attach a bleeder tube to the bleeder
fitting.
The end of the tube should
fit snugly around the bleeder fit-
ting.
4.
Open the valve on the bleeder
tank to admit pressurized brake fluid
to the master cylinder reservoir.
5.
Submerge the free end of the
tube in a container partially filled
with clean brake fluid, and loosen
the bleeder fitting.
6.
When air bubbles cease to ap-
pear in the fluid at the submerged
end of the bleeder tube, close the
bleeder fitting and remove the tube.
7.
Repeat this procedure at each
brake wheel cylinder in the follow-
ing order: left rear, right front, and
left front.
8.
When the bleeding operation is
completed, close the bleeder tank
valve and remove the tank hose from
the adapter fitting.
9.
Remove the adapter cap, refill
the master cylinder reservoir to with-
in
%
inch from the top of the reser-
voir, and install the filler cap.
tracting and hold down springs is
necessary.
Overheated springs lose
their pull and could cause the new
lining to wear prematurely, if they
are not replaced.
5.
If the car has
24,000
or more
miles of operation on the brake lin-
ings or signs of overheating are pres-
ent when relining brakes, the wheel
cylinders should be disassembled and
inspected for wear and entrance of
dirt into the cylinder. The cylinder
cups should be replaced, thus avoid-
ing future problems.
To Next Page
Loading...
