BENDIX BW2234 Manuel D’Utilisation

 Review the warranty policy before performing 

any intrusive maintenance procedures.  An extended 
warranty may be voided if intrusive maintenance is 
performed during this period.  Purge valve maintenance 
is permissible during the warranty period only when using 
a genuine Bendix

®

 purge valve kit.

Because no two vehicles operate under identical 
conditions, maintenance and maintenance intervals will 
vary.  Experience is a valuable guide in determining the best 
maintenance interval for any one particular operation.

1.  Check for moisture in the air brake system by opening 

reservoir drain valves and checking for the presence 
of water.  If moisture is present, the desiccant cartridge 
may require replacement; however, the following 
conditions can also cause water accumulation and 
should be considered before replacing the desiccant:

A.  An outside air source has been used to charge the 

system.  This air did not pass through the drying 
bed.

B.  Air usage is exceptionally high and not normal for 

a highway vehicle.

 

This may be due to accessory air demands or some 
unusual air requirement that does not allow the 
compressor to load and unload (compressing and 
non-compressing cycle) in a normal fashion. Check 
for high air system leakage. If the vehicle vocation 
has changed, it may be necessary to upgrade the 
compressor size. Refer to Bendix Specifi cation 
BW-100-A / Appendix D, to determine if any changes 
are necessary.  Specifi cation BW-100-A is available 
from the Bendix TechTeam at 1-800-247-2725 or 
www.bendix.com.

C.  The location of the air dryer and reservoir system 

is too close to the air compressor. Refer to Bendix 
Specifi cation BW-110-A / Appendix B, for discharge 
line lengths.

D.  In areas where more than a 30 degree range of 

temperature occurs in one day, small amounts 
of water can temporarily accumulate in the air 
brake system due to condensation.  Under these 
conditions, the presence of small amounts of 
moisture is normal.

 

 

Oil removal requirements for air brake quality vary 
by vehicle manufacturer.  Because vehicle vocation 

and maintenance can infl uence when the Bendix

®

 

AD-IS

®

 PuraGuard

®

 oil coalescing air dryer cartridge 

requires replacement, each fl eet should modify their 
replacement schedule based on experience.  The 
change out interval will be extended if the compressor 
passes a low level of particles.  The interval will be 
reduced if excessive carbon particles are delivered to 
the dryer inlet.  Higher compressor build up times at 
idle, as well as water or oil in downstream reservoirs 
indicate an AD-IS PuraGuard oil coalescing air dryer 
desiccant cartridge may need to be replaced.

 

Note: A small amount of oil in the system is normal and 
should not be considered as a reason to replace the 
desiccant cartridge.  Some oil at the dryer exhaust is 
also normal.

2.  Visually check for physical damage, such as chaffed or 

broken air and electrical lines, and broken or missing 
parts.

3. Check 

the 

AD-IS

®

 air dryer and purge reservoir bolts for 

tightness. See Figure 1.  Re-torque the three air dryer 
bolts to 360–420 in-lbs and the four purge reservoir 
bolts to 300–360 in-lbs.

4.  Perform the Operation & Leakage Tests listed in this 

publication.

HEATER & THERMOSTAT 

CONNECTOR