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BRAKES (CONTINUED)
SYMPTOM
EXCESSIVE LEAKAGE WITH
EMERGENCY SYSTEM ONLY
APPLIED - NO LEAKAGE WITH
NORMAL BRAKING
EXCESSIVE WATER PRESENT IN
BRAKE SYSTEM
EXCESSIVE OIL PRESENT IN
BRAKE SYSTEM
BRAKE WILL NOT APPLY
PROPERLY
BRAKES WILL NOT APPLY
WHEN EMERGENCY LINE IS
DISCONNECTED
ABS WARNING LIGHT
STAYS ON
5-4 BRAKE DRUMS
SYMPTOM
EXCESSIVE LOSS OF BRAKES
OR FADING
BRAKES PULL TO EITHER SIDE
ROUGH OR NOISY BRAKING
ACTION
VIBRATION IN RIDE
Defective relay emergency valve: repair or replace valve.
Reservoir not drained often enough: drain reservoir daily.
Compressor on tractor passing excessive oil: repair com-
pressor.
Flat spot on cam roller or camshaft: replace and lubricate.
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.
Refer to Rockwell WABCO ABS maintenance manual sup-
plied with trailer for system function and use of blink code
diagnostics.
See Sections 4-6, 4-7, 4-8, 4-9, 4-10.
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.
Drums of different diameters: replace with drums of same di-
ameter.
Foreign matter in drums: clean drums out.
Defective drums: pull drums and inspect for any of the follow-
ing; 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 re-
place defective part(s).
Defective drums or out-of-round: replace drums.
Out-of-balance drums: balance drums.
PROBLEM: REMEDY
PROBLEM: REMEDY
5-5
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