Page M-4
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
Summary of Contents for EXPRESS L4
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