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The information described in Maintenance Manual X-7525 under the heading
BRAKES is applicable to models covered by this supplement with the exception of
the following :
CAUTION:
ALL BRAKE SYSTEM FASTENERS ARE IMPORTANT ATTACHING PARTS
IN
THAT THEY
COULD AFFECT THE PERFORMANCE OF VITAL COMPONENTS AND SYSTEMS, AND/OR COULD
RESULT IN MAJOR REPAIR EXPENSE. THEY MUST BE REPLACED WITH ONE OF THE SAME PART
NUMBER OR WITH AN EQUIVALENT PART IF REPLACEMENT BECOMES NECESSARY . D O NOT USE
A REPLACEMENT PART OF LESSER QUALITY OR SUBSTITUTE DESIGN . TORQUE VALUES MUST
BE USED AS SPECIFIED DURING REASSEMBLY TO ASSURE PROPER RETENTION OF THESE PARTS.
WARNING:
WHEN SERVICING WHEEL BRAKE PARTS DO NOT CREATE DUST BY GRINDING
OR SANDING BRAKE LININGS OR BY CLEANING WHEEL BRAKE PARTS WITH A DRY BRUSH
OR WITH COMPRESSED AIR. (A WATER DAMPENED CLOTH SHOULD BE USED.) MANY WHEEL
BRAKE PARTS CONTAIN ASBESTOS FIBERS WHICH CAN BECOME AIRBORNE IF DUST IS CREATED
DURING SERVICING. BREATHING DUST CONTAINING ASBESTOS FIBERS MAY CAUSE SERIOUS
BODILY HARM.
BLEEDING BRAKE SYSTEM
A new brake bleeding sequence is shown in
figure 1 .
This new sequence
reduces the
possibility of having to rebleed wheel cylinders
a second time
to
eliminate
air
from
the
system .
REAR BRAKE SHOE ADJUSTMENT
Under normal operating conditions it is not
necessary to make any manual adjustment to
this type brake due to the automatic ad-
justment feature.
However, when it is nec-
essary to remove a brake drum it may also be
necessary to "back-off" the adjusting screw in
order to pull edge of drum past linings .
(see
figure 2)
1. If shoes are being adjusted for the first
time, use
a
suitable punch to knock out the
metal blank in backing plate (located at lanced
BRAKE DRUM REMOVAL
1 . Hoist wheels off ground .
NOTE : It may be necessary
to
back off the
brake shoe adjustment before the brake
SECTION 5
BRAKES
ON-VEHICLE SERVICING
COMPONENT REPLACEMENT
area, see figure 3) .
Be sure all metal is
removed from the--brake assembly .
2 . Install hub and drum assembly. Refer to
BRAKE DRUM INSTALLATION .
3 . Use brake adjusting tool (J-4735) to turn
brake adjusting screw. Expand brake shoes at
each wheel until the wheel can just be turned
by hand .
The drag should be equal at all
wheels.
4. Back off brake adjusting screw (figure 2)
at each wheel 30 notches. If shoes drag lightly
on drum back off adjusting screw one or two
additional notches.
NOTE :
Brake should be free of drag when
screw has been backed off approximately 12
notches .
Heavy drag at this
point
indicates
tight parking brake cables..
5. Install brake adjustment cover in backing
plate when adjustment is completed .
6 . Check parking brake adjustment .
drum can be removed.
To back off brake
shoe adjustment, refer to Figure 2.
2 . Remove wheel and tire .
3. Remove
outer dust
cap as shown. i n
Figure 4, and then inner cap.
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