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 supplied
with semitrailer, for system function and use of blink code di-
agnostics
.
5-4 BRAKE DRUMS
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 op-
erating 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.
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 compo-
nents, foreign matter in drums. Correct situation or replace defec-
tive part(s).
VIBRATION IN RIDE
Defective drums or out-of-round:
replace drums.
Out-of-balance drums:
balance drums.
5-6
Summary of Contents for 825A
Page 8: ......
Page 12: ......
Page 14: ...3 2 Figure 3 1 Model 825 Trailer Terminology Figure 3 2 Service Hookups...
Page 18: ...3 6 Figure 3 3 Hydraulic Controls...
Page 22: ...3 10 Figure 3 5 Swingout Outrigger Platform Extension...
Page 24: ...3 12 Figure 3 6 Gooseneck Attachment to Frame...
Page 34: ......
Page 36: ...4 2 Figure 4 1 Lubrication Points...
Page 40: ...4 6 Figure 4 2 Model 825A Wiring Diagram...
Page 43: ...4 9 Figure 4 4 Tandem Axle Air Ride Suspension System...
Page 44: ...4 10 Figure 4 5 Tandem Axle W Flip Air Ride Suspension System...
Page 47: ...4 13 Figure 4 8 Checking Axle Alignment Figure 4 9 Examples of Camber...
Page 52: ...4 18 Figure 4 12 Axle and Brake Assembly...
Page 59: ...4 25 Figure 4 18 Mounting Tires and Wheels Figure 4 19 Stud Tightening Sequence...
Page 69: ...NOTES 5 9...
Page 70: ......