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OPERATION & LEAKAGE TESTS (REFER TO THE

TROUBLESHOOTING CHART IN THIS MANUAL)

For additional information see video BW2237.

1. Check all lines and ﬁ ttings leading to and from the air

dryer and reservoir system for leakage and integrity.

Repair any leaks found.

2. Build up system pressure to governor cut-out and note

that the Bendix

AD-IS

escape of air. Watch the system pressure and note the

pressure fall-off for a ten minute period. If pressure

drop exceeds—a) for a single vehicle: 1 psi/minute

from either service reservoir; or b) for tractor trailer: 3

psi/minute from either service reservoir—inspect the

vehicle air systems for leak sources and repair them.

Refer to the Symptoms 1 and 4 in the Troubleshooting

Chart.

3. Caution: Be sure to wear safety glasses in case

of a purge blast. Check for excessive leakage around

the purge valve with the compressor in the charge mode

(compressing air). Apply a soap solution to the purge

valve exhaust port and observe that leakage does not

exceed a 1" bubble in one second. If any leakage

exceeds the maximum speciﬁ ed, refer to Symptom 4

in the Troubleshooting Chart.

4. Build up system pressure to governor cut-out and note

that the AD-IS air dryer purges with an audible burst of

air, followed immediately by approximately 30 seconds

of air ﬂ owing out of the purge valve. "Fan" the service

brakes to reduce system air pressure to governor

cut-in. Note that the system once again builds to full

pressure and is followed by a purge. If the system does

not follow this pattern, refer to Symptoms 5 and 6 in

the Troubleshooting Chart .

5. Check the operation of the end cover heater and

thermostat assembly during cold weather operation as

follows:

A. Electric Power to the Dryer (Refer to Figure 4.)

With the ignition or engine kill switch in the RUN

position, check for voltage to the heater and

thermostat assembly using a voltmeter or test light.

Unplug the electrical connector at the air dryer and

reservoir system and place the test leads on each

of the connections of the female connector on the

vehicle power lead. If there is no voltage, look for a

blown fuse, broken wires, or corrosion in the vehicle

wiring harness. Check to see if a good ground path

exists.

B. Thermostat and Heater Operation

Note: These tests are not possible except in cold

weather operation.

Turn off the ignition switch and cool the thermostat

air dryer purges with an audible

and heater assembly to below 40° Fahrenheit. Using

an ohmmeter, check the resistance between the

electrical pins in the air dryer and reservoir system

connector half. The resistance should be 1.5 to 3.0

ohms for the 12 volt heater assembly, and 6.0 to 9.0

ohms for the 24 volt heater assembly.

Warm the thermostat and heater assembly to

approximately 90° Fahrenheit and again check the

resistance. The resistance should exceed 1000

ohms. If the resistance values obtained are within

the stated limits, the thermostat and heater assembly

is operating properly. If the resistance values

obtained are outside the stated limits, replace the

heater and thermostat assembly.

6. Pressure Protection Valves. Observe the pressure

gauges of the vehicle as system pressure builds from

zero. The primary or secondary gauge should rise until

it reaches approximately 106 psi (±6 psi), then level

off (or a momentary slight fall) as the next pressure

protection valve opens—supplying its reservoir. When

that pressure gauge passes through approximately 106

THE BENDIX

AD-IS

AIR DRYER GOVERNORS ARE

NON-ADJUSTABLE

AND FEATURES A BREATHER

VALVE IN THIS PORT

FIGURE 5 - PRESSURE PROTECTION VALVE LOCATIONS

WARNING:

DO NOT ATTEMPT TO ADJUST OR

SERVICE THE PRESSURE PROTECTION

VALVES. INCORRECT PRESSURE

PROTECTION VALVE SETTINGS CAN

RESULT IN AUTOMATIC APPLICATION

OF VEHICLE SPRING BRAKES WITHOUT

PRIOR WARNING.

PRESSURE

PROTECTION

VALVE

LOCATIONS