B
70
Repair and Service Manual
BRAKES
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
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FAULT DIAGNOSIS AND INSPECTION
New Vehicle
A new vehicle will undergo an initial break-in of compo-
nents including brake cables and brake shoes. In this
break-in period, it is not uncommon for the brake pedal
free travel (and the effort required to latch the park brake)
to change. The timing of this change varies with terrain
and the driving habits of the operator(s). When this
occurs, the brake linkage should be adjusted. See “Adjust-
ing Brake Pedal Free Travel” on page 77. After this initial
period, no further adjustments are required until routine
maintenance is scheduled.
Fault Diagnosis and Inspection Procedures
To fault diagnose the mechanical brake system, inspect
the brake pedal and linkage to find worn or damaged
parts per the Fault Diagnosis Flowchart (Ref. Fig. 5).
Then, perform the Periodic Brake Performance Test to
evaluate system performance. Based on the results of the
inspection and tests, refer to the Fault Diagnosis Table
(Ref. Fig. 6) to evaluate symptoms and repairs. If
required, disassemble the wheel brake to locate and cor-
rect internal faults.
Instructions for removal or replacement of parts and
adjustments referred to in this section of the manual are
described in detail under “MAINTENANCE AND
Satisfactory brake performance does not eliminate
the need for routine brake testing and inspection as
indicated in the Periodic Service Schedule in Sec-
tion A. Continued proper brake operation depends
on periodic maintenance.
Unequal braking (one wheel locks
while other rotates)
Wheel not locking is not adjusting
Check brake operation of wheel that is
not
locking
Sticky/dragging cable
Check for brake lever return
Check that brake levers return at equal
rate - (Indication of dragging cable)
Cracked brake drum
Replace
Brake shoes wet or glazed
Check again when shoes are dry
Rusted or sticky brake pivot hardware
Replace
Neither wheel locks
Brake system requires complete
adjustment
Adjust entire system
Brake pedal not returning
Check for binding of brake pedal
Check brake pedal free travel
Grabbing brakes (oversensitive)
Moisture has caused surface rust on
drums
Apply moderate force to pedal while at
maximum level ground speed to remove
rust until condition is relieved.
Brake Pivot binding
Check and replace poor components
Park brake hard to latch
Inadequate free play
Adjust pedal free travel at spherical nut
and check that wheel brake actuators
are returning fully
Sticky/dragging cable
Check for brake lever return
Check that brake levers return at equal
rate - (Indication of dragging cable)
Dragging shoes
Check wheel brakes
Park brake will not stay latched
Excessive wear
Check for worn latch mechanism
Condition
Possible Cause
Correction
Fig. 6 Fault Diagnosis Table