TROUBLESHOOTING
5-5
Brake Drums
For maintenance procedures, refer to the following
sections:
• “Suspension Maintenance” on page 4-9
• “Brake System Maintenance” on page 4-13
• “Hub and Drum Maintenance” on page 4-19
• “Wheel Bearing Lubrication and Adjustment” on
BRAKES GRABBING
Grease on brake linings
Reline brakes
Brake rigging binding
Align brakes or replace bent parts
Defective brake valve on tractor
Repair or replace valve
Defective relay emergency valve
Repair or replace valve. Excessive
leakage with brakes released.
Relay emergency valve leaking
Repair or replace valve
Leaking tubing or hose
Replace defective part
EXCESSIVE LEAKAGE WITH BRAKES
APPLIED
Relay emergency valve leaking
Repair or replace valve
Leaking brake chamber diaphragm
Replace diaphragm
Leaking tubing or hose
Replace defective part
EXCESSIVE LEAKAGE WITH
EMERGENCY SYSTEM ONLY APPLIED -
NO LEAKAGE WITH NORMAL BRAKING
Defective relay emergency valve
Repair or replace valve
EXCESSIVE WATER PRESENT IN
BRAKE SYSTEM
Reservoir not drained often enough
Drain reservoir daily
EXCESSIVE OIL PRESENT IN BRAKE
SYSTEM
Compressor on tractor passing excessive
oil
Repair compressor
BRAKE WILL NOT APPLY PROPERLY
Flat spot on cam roller or camshaft
Replace and lubricate
BRAKE WILL NOT APPLY WHEN
EMERGENCY LINE IS DISCONNECTED
Initial air pressure too low
Allow air system to build up to minimum 90
PSI and stabilize
Defective relay valve
Repair or replace valve
Air line leak
Locate leak and repair
Brake chamber leak
Locate leak and repair or replace
ABS WARNING LIGHT STAYS ON
Refer to Rockwell WABCO ABS maintenance manual supplied with trailer for system
function and use of blink code diagnostics.
PROBLEM
PROBABLE CAUSE
SOLUTION
PROBLEM
PROBABLE CAUSE
SOLUTION
EXCESSIVE LOSS OF BRAKES OR
FADING
Overheated brake drums
Check for defective or misadjusted brake
linings, distorted or over-machined
drums. Also check for operating
conditions or loads that create severe
or excessive brake applications.
BRAKES PULL TO EITHER SIDE
Drums of different diameters
Replace with drums of same diameter.
Foreign matter in drums
Clean drums out
ROUGH OR NOISY BRAKING ACTION
Defective drums
Pull drums and inspect for any of the
following. Heat spotted drums, grease
spotting, blue drums, scored drums,
excessive wear at rivet holes or edges,
polished drums, out of round drums,
unbalanced drums, worn/damaged
brake components, foreign matter in
drums. Correct situation or replace
defective part(s).
VIBRATION IN RIDE
Defective drums or out-of-round
Replace drums
Out-of-balance drums
Balance drums
Summary of Contents for 345E
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Page 20: ...3 10 F 563 0610 Edition OPERATING INSTRUCTIONS Figure 3 4 Steps for Loading and Unloading...
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Page 44: ...4 16 F 563 0610 Edition MAINTENANCE AND LUBRICATION Figure 4 10 Axle and Brake Assembly...
Page 60: ...5 8 F 563 0610 Edition TROUBLESHOOTING Notes...
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