Landoll 600B Series, Operator'S Manual

Page: 80 / 84

BRAKES (CONTINUED)
SYMPTOM PROBLEM: REMEDY
BRAKES 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 sup-
plied with semitrailer, for system function and use of blink
code diagnostics .
5-4 BRAKE DRUMS
For maintenance procedures, See Sections 4-6 - 4-10.
SYMPTOM PROBLEM: REMEDY
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 di-
ameter.
Foreign matter in drums: clean drums out.
Damaged air lines: check for damaged air lines to respective
side of semitrailer.
Brakes not adjusted correctly: readjust brakes and check
slack adjuster operation.
ROUGH OR NOISY BRAKING AC-
TION
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).
VIBRATION IN RIDE Defective drums or out-of-round: replace drums.
Out-of-balance drums: balance drums.
5-6