100
BRAKES
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
improves, increase speed for the remaining tests. Before
the end of the tests, both wheels must lock at approxi-
mately the same time and slide straight.
The brake adjuster mechanism must expand and
release completely to function. With light usage this may
not occur, even though the vehicle stops acceptably.
The adjuster will function most consistently with aggres-
sive braking.
Figure 6 Equally Load Vehicle
Wheel Brake Inspection
Wear a dust mask and eye protection when
you do work on wheel brakes. Do not use
pressurized air to blow dust from brake assem-
blies. Replace both brake shoes on both
wheels if any shoes are worn below .06” (1.5
mm) thickness at any point.
Do NOT touch any of the wheel brake mechanism
except as shown.
Do NOT use a commercial brake cleaner unless the
full brake has been disassembled.
1. Remove the brake drums.
Do not disturb adjuster mechanisms. Remove
excess dust and dirt from the drum with a brush.
The drum must not be machined to remove
grooves on the friction surface. Machining the
drum will make the wall too thin and cause the
drum to fail. Drum failure will cause a loss of
braking capacity which can cause severe
injury or death.
2. Inspect the brake drum.
Look for a blue coloration or blistered paint that can
indicate that it has overheated. Check for grooves on
the friction surface. Check for an area worn below
the rest of the friction surface indicating excessive
wear. Inspect the splines for surface damage, wear
and corrosion. If any of these problems are found,
the drum must be replaced.
3. Remove any brake dust from the wheel brake
assembly with a brush.
4. Visually inspect the axle seal for oil leakage and the
condition of the thrust washer. If the oil is found, see
REAR AXLE section.
5. Confirm the inner brake drum washer is found and
check its condition. Replace damaged or missing
component.
If one wheel brake assembly needs replace-
ment, the second must also be replaced.
Use care when you handle the adjuster arm. Exces-
sive force will damage the adjuster and both wheel
brake assemblies will need to be replaced.
6. Visually check the condition and operation of the
adjuster mechanism.
Inspect the brake lever for damage or wear. Test the
adjuster function as follows:
Push the front brake shoe in the direction of the rear
of the vehicle and hold in position.
Operate the brake lever.
Observe the brake adjuster arm and note if the arm
engages the star wheel and tries to rotate it (Figure
7).
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