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Congratulations, your new vehicle is equipped

with a Bendix

featuring a Bendix

YSTEM

™

The Bendix

DRM

module has an integrated reservoir,

air dryer and valve system. This means that when the air

pressure in the system builds from zero, the order in which

the reservoirs ﬁ ll is much different than a traditional three(3)

reservoir system. Observe the pressure gauges of the

vehicle as system pressure builds from 0 psi. The primary

reservoir gauge rises until it reaches about 110 psi, then

the secondary reservoir begins to build. As the secondary

reservoir builds initial pressure to approximately 55 psi –

then to approximately 85 psi – a sequence of two pressure

protection valves open, supplying vehicle accessories. At

about 110 psi, both primary and secondary reservoirs charge,

simultaneously, until governor cut-out is reached.

RAKE

The Bendix

AD-IS

air dryer design innovations allow the

system to maintain one brake circuit, up to about 100 psi,

even if there is a pressure loss in the other brake circuit. For

example, when one reservoir drain cock is opened, initially

both reservoir gauges will fall; however, the AD-IS

pressure protection valves will close at pressures at or above

70 psi, protecting the remaining brake circuit from further

loss of pressure.

OADSIDE

As outlined above, the Bendix

advancements mean that, in the event of a roadside

inspection, the system behavior includes: When the system

is charged to governor cut-out – and then when one reservoir

drain cock is opened – initially both reservoir gauges will fall.

The AD-IS

air dryer pressure protection valves, however,

will close at pressures at or above 70 psi, protecting the

remaining brake circuit from further loss of pressure.

Dryer Reservoir Module (DRM

MPORTANT

HARGE

EQUENCE

IRCUIT

ROTECTION

NSPECTIONS

AD-IS

air dryer design

AD-IS

YSTEM

ERFORMANCE

In general, we recommend that maintenance checks be

made every 900 operating hours; 25,000 miles; or three(3)

months, whichever comes ﬁ rst (see warranty publication

BW1715 for details). Important: Review the warranty policy

before performing any intrusive maintenance procedures.

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. See the Service

Data Manual for more information (SD-98-9808).

The Bendix

covers Bendix air system components installed as original

equipment on the vehicle for three(3) years or 350,000

miles. See Warranty (publication BW1716) for full details –

restrictions apply.

INTEGRATED PURGE

dryer's

SECONDARY

RESERVOIR

Air Dryer.

OTES

AINTENANCE

NTERVALS

TAG W

ARRANTY

Total Air Guarantee (TAG) limited warranty

DESICCANT

RESERVOIR

CARTRIDGE

GOVERNOR

HEATER/

THERMOSTAT

™

)

SAFETY

VALVE

AD-IS

AIR DRYER

PRESSURE

PROTECTION

VALVES

Printed on recycled paper