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BENDIX

SYMPTOM

5. Cannot build system air

pressure.

6. Air dryer does not purge or

exhaust air.

7. Desiccant material being

expelled from air dryer purge

valve exhaust (may look like

whitish liquid or paste or

small beads.)

8. Unsatisfactory desiccant life. A. Excessive system leakage.

9. "Pinging" noise excessive

during compressor loaded

cycle.

10. The air dryer purge piston

c y c l e s r a p i d l y i n t h e

compressor unloaded (non-

compressing) mode.

AD-IS

AIR DRYER AND RESERVOIR SYSTEM

TROUBLESHOOTING CHART

CAUSE

A. Supply pressure to the air dryer is not

sufﬁ cient.

B. Kinked or blocked (plugged) discharge

line.

C. Excessive bends in discharge line

(water collects and freezes).

D. Pressure protection valve(s) in air

dryer will not open.

E. Refer to Symptom 4.

F. Refer to Symptom 7.

A. Faulty air dryer purge valve.

B. See Causes B, E, and F for Symptom

#4.

A. Faulty dryer cartridge.

B. Excessive dryer vibration.

B. Wrong vehicle application for AD-IS

air dryer.

C. Compressor passing excessive oil.

A. Single cylinder compressor with high

pulse cycles.

A. Compressor fails to "unload".

REMEDY

A. Ensure the supply pressure to the air dryer is greater than

110 psi after the system charges.

B. Check to determine if air passes through discharge line.

Check for kinks, bends, excessive carbon deposits, or ice

blockage.

C. Discharge line should be constantly sloping from compressor

to air dryer with as few bends as possible.

D. Replace air dryer (pressure protection valves are not

serviceable).

E. Refer to Symptom 4, Remedy A.

F. Refer to Symptom 7, Remedies A and B.

A. After determining air reaches purge valve control port by

installing a T-ﬁ tting with a pressure gauge into the governor

unloader port, repair purge valve if necessary.

B. Refer to Symptom 4, Remedies B, E, and F.

Also refer to Symptom 1, Remedy B.

A. Replace the Bendix

AD-IS

dryer.

B. Check the AD-IS air dryer mounting for looseness or damage.

Repair mounting and replace cartridge.

A. Refer to Symptom 1, Remedy A.

B. Refer to Symptom 2, Remedy C.

C. Check for proper compressor installation; if symptoms

persist, replace compressor. Refer to Bendix Advanced

Troubleshooting Guide for Air Brake Compressor (BW1971).

A. A slight "pinging" sound may be heard during system build

up when a single cylinder compressor is used. If this sound

is deemed objectionable, it can be reduced substantially by

increasing the discharge line volume.

This can be accomplished by adding a 90 cubic inch (or

larger) reservoir between the compressor and the AD-IS air

dryer and reservoir system.

A. Check air hose from governor to compressor for a missing,

kinked or restricted line. Install or repair air hose.

Repair or replace compressor unloader.

air dryer cartridge or AD-IS air