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B
BRAKES
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
75
Repair and Service Manual
634756
The drum must not be turned to “true” a worn
friction surface. Turning will make the drum too
thin and cause drum failure and a loss of brake
functionality, which could cause severe injury
or death.
2.
Inspect the brake drum.
Look for a blue coloration or blistered paint that
would indicate that it has overheated. Check for evi-
dence of scoring. Check for excessive wear indi-
cated by the friction surface being significantly worn
and leaving a ledge of unworn drum. Inspect the
splines for galling, wear and corrosion. If any of
these problems are present, the drum must be
replaced.
3.
Remove any accumulated 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 oil is present, see
REAR AXLE section.
5.
Verify the inner brake drum washer is present and
check its condition. Replace if damaged or missing.
If one wheel brake assembly is replaced, the
second must also be replaced.
Use care when handling the adjuster arm. Too much
force will damage the adjuster and require that both
wheel brake assemblies 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 attempts to
rotate it (Ref. Fig. 17).
•
If the adjuster arm
engages and turns
the star
wheel, proceed. If the arm
fails to engage
the
star wheel, it has been damaged and both wheel
brake assemblies must be replaced.
•
If the adjuster arm engages the star wheel but
fails to rotate it
, the adjuster assemblies must
be replaced with new color-coded adjusters.
Note the location of the two Teflon coated wash-
Fig. 17 Adjuster Mechanism
7.
Check the condition and operation of the moving
anchor assembly (Ref. Fig. 24).
Operate the brake lever to check for free motion. The
adjuster assembly and brake lever should move
smoothly from front to back on the backing plate. If
the moving anchor assembly is damaged or binds
against the backing plate, replace both wheel brake
assemblies.
A backing plate assembly that shows any indi-
cation of galling or gouging is not repairable
and must be replaced with a new wheel brake
assembly. Always replace wheel brake assem-
blies in pairs.
8.
Inspect the backing plate.
Inspect for gouges, galling or other damage, particu-
larly where the backing plate is contacted by the
brake shoes and by the moving anchor assembly.
Replace both backing plates if any gouges or galling
is found.
9.
Measure the brake shoe thickness.
Measure at the most worn area. Brake shoe thick-
ness must never be less than .06" (1.5 mm) at any
point on the shoe. It is normal for the shoes to show
more wear at the leading and trailing edges (Ref.
Fig. 16). If the brake shoe thickness is approaching.
06" (1.5 mm), it is recommended that the shoes be
replaced. It is recommended that the brake shoe
springs and brake adjusters be replaced when
installing new brake shoes.
Brake Adjuster
Arm
Star
Wheel
Adjusting
Screw
Wheel Brake
Lever