Page K-6
Repair and Service Manual
B
MECHANICAL BRAKES
Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
TROUBLESHOOTING TABLE
Refer to the following troubleshooting table only after the thorough visual inspection, Periodic Brake Performance Test
(PBPT), and Aggressive Stop Test is performed (Ref. Fig. 5).
Condition
Possible Cause
Correction
Fails Brake Performance Test by stop-
ping in a longer distance than normal
Wheel brake failure due to severely
worn or damaged components.
Replace all severely worn or damaged
components.
Brake pedal not returning
Brake not adjusting.
Check for binding of brake pedal .
Check brake pedal free travel.
Check brake cables.
Check brake adjusters.
Check pedal pivot.
Brake shoes wet.
Check again when shoes are dry.
Brake cables damaged or sticky.
Check brake cable and replace if sticky or
damaged.
Brake shoes severely worn.
Replace.
Brake shoes glazed.
Sand shoes with emery cloth provided that
shoes have .06" (1.5 mm) min. material.
System not adjusted properly.
Check and adjust per manual.
End of brake cable loose from anchor
brackets.
Check and repair.
Cracked brake drum.
Replace.
In excess of 1 1/8" (2.9 cm) free pedal
travel (Soft Pedal)
In Excess of 2 1/4" (5.4 cm) free peda
travel (Soft Pedal)
Low pedal force at parking brake latch.
Adjust per manual.
Brake cables damaged.
Replace.
Brake return bumper out of adjustment. Adjust per manual.
End of brake cable loose from anchor
brackets.
Check and repair.
Wheel brake failure due to severely
worn or damaged components.
Replace all severely worn or damaged
components.
System not adjusted properly.
Adjust per Manual.
Less than 7/8" (2.2 cm) free pedal trav-
el (Hard Pedal)
Less than 2" (5 cm) free pedal travel
(Hard Pedal)
High pedal force at parking brake latch. Adjust per Manual.
Brake cables damaged or sticky.
Check brake cable and replace if sticky or
damaged.
System not adjusted properly.
Check and adjust per manual.
Wheel brake failure due to severely
worn or damaged components.
Replace all severely worn or damaged
components.
Neither wheel locks when park brake
is latched. (Note: At full speed the
wheels may not lock, but should brake
aggressively).
Incorrect compensator spring adjust-
ment.
Return to factory specification.
Excessive brake pedal free travel.
Adjust per manual.
Fig. 5 Troubleshooting Table
Содержание EXPRESS L6 2012
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