SYMPTOM
PROBLEM: REMEDY
NO BRAKES
Open circuits:
Find and correct.
Severe Underadjustment:
Adjust brakes.
Faulty Controller:
Test and correct.
Short Circuits:
Find and correct.
WEAK BRAKES
Grease or Oil on Magnets or Linings:
Clean or re-
place .
Corroded Connections:
Clean and correct cause of
corrosion..
Worn Linings or Magnets:
Replace.
Scored or Grooved Brake Drums:
Machine or re-
place.
Improper Synchronization:
Correct.
Underadjustment:
Adjust brakes.
Glazed Linings:
Reburnish or replace.
Overloaded Trailer:
Reduce to within load restric-
tions.
LOCKING BRAKES
Underadjustment:
Adjust brakes.
Improper Synchronization:
Correct.
Faulty Controller:
Test and correct.
Loose, Bent, or Broken Brake Components:
Re-
place components.
Out-of-Round Brake Drums:
Machine or replace.
Insufficient Wheel Load:
Adjust system resistor and
synchronize.
INTERMITTENT BRAKES
Faulty Controller:
Test and correct.
Broken Wires:
Repair or replace.
Loose Connections:
Find and repair.
Faulty Ground:
Find and repair.
BRAKES PULL TO ONE SIDE
Wrong Magnet Lead Wire Color:
Correct.
Incorrect Adjustment:
Adjust.
Grease or Oil on Magnets or Linings:
Clean or re-
place .
Broken Wires:
Repair or replace.
Bad Connections
: Find and repair.
HARSH BRAKES
Underadjustment:
Adjust brakes.
Improper Synchronization:
Correct.
Improper Controller:
Change.
Faulty Controller:
Test and correct
NOISY BRAKE
Underadjustment:
Adjust brakes.
Lack of Lubrication: Replace and lubricate.
Broken Brake Components:
Replace components.
Incorrect Brake Components:
Correct.
SURGING BRAKES
Grease or Oil on Magnets or Linings:
Clean or re-
place .
Out-of-Round Brake Drums:
Machine or replace.
Faulty Controller:
Test and correct.
DRAGGING BRAKES
Overadjustment:
Readjust
Out-of-Round Brake Drums:
Machine or replace.
Incorrect Brake Components:
Replace.
Loose, Bent, or Broken Brake Components:
Re-
place components.
Faulty Breakaway Switch
: Repair or replace.
Broken Wires:
Repair or replace.
Loose Wheel Bearing Adjustment:
Adjust.
Bent Spindle:
Replace axle.
5-4
Summary of Contents for L20 Series
Page 2: ......
Page 8: ......
Page 15: ...3 3 Figure 3 3 Electrical Assembly For Trailer w Electric Brakes...
Page 16: ...3 4 Figure 3 4 Electrical Assembly For Trailer w Air Brakes...
Page 26: ...4 6 Figure 4 3 Axle and Brake Assembly...
Page 35: ...4 15 Figure 4 12 Mounting Tires and Wheels Figure 4 13 Stud Tightening Sequence...
Page 39: ...NOTES 4 19...
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