BENDIX AD-IS User's Manual | Page 8
If, after completing the routine operation and leakage tests,
it has been determined that one or more components of the
air dryer and reservoir system requires replacement or
maintenance, refer to the following list to find the appropriate
MAINTENANCE KITS AVAILABLE:
Service New Desiccant Cartridge Kit - Part Number
5008414: This kit contains the parts necessary to change
the desiccant cartridge only.
Delivery Check Valve Maintenance Kit - Part Number
5004052: This kit contains the parts necessary to replace
the delivery check valve.
Purge Valve Maintenance Kit - Part Number
5018313: This kit contains the parts necessary to
replace and relubricate the purge valve sealing rings.
Governor/Delivery Check Valve Kit - Part Number
5004049: This kit contains the parts necessary to replace
both the governor and delivery check valve.
12 volt or 24 volt Heater and Thermostat Kit - Part
Numbers 109495 & 109496: Contains a replacement
heater and thermostat assembly and related components
required for replacement.
Purge Valve Housing Rebuild Kit - Part Number
5003547: This kit contains the parts necessary to rebuild
the purge valve sub-assembly.
Service New Purge Valve Housing Assembly - Part
Number 800404: Contains a service new assembly
and related components to change the purge valve sub-
Pressure Protection Valve Boot Replacement- Part
AD-IS® Air Dryer Replacement: Replaces the complete
air dryer assembly. Includes air dryer assembly and
AD-IS® Air Dryer Splash Shield Replacement Kit -
Part Number 5006698.
Purge Reservoir Drain Valve: Replaces the drain valve
on the purge reservoir.
SEE THE AD-IS® AIR DRYER CATALOG PAGE
(STARTING ON PAGE 08-A-24) FOR A FULL LIST
OF MAINTENANCE KITS AVAILABLE.
NOTE: Kits are not available for the servicing of the pressure
protection valves (See Figure 5). Do not attempt to adjust
or service the pressure protection valves - these are not
TESTING THE AD-IS® AIR DRYER AND
Before placing the vehicle in service, perform the following
1. Close all reservoir drain valves.
2. Build up system pressure to governor cut-out and note
that the AD-IS® air dryer and reservoir system purges
with an audible burst of air, followed immediately by
approximately 30 seconds of air flowing out of the purge
3. “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 at the AD-IS®
air dryer and reservoir system exhaust.
4. It is recommended that the total air system be tested for
leakage to assure that the AD-IS® air dryer and reservoir
system will not cycle excessively.
See Bendix publication BW5057 "Air Brake Handbook."
BRAKING SYSTEM PROTECTION
The AD-IS® air dryer and reservoir system allows the system
to maintain one brake circuit up to about 100 psi even after
a pressure loss in the other brake circuit. This allows a
vehicle to be moved (in an emergency), but with reduced
braking capacity. Compare this to a conventional system
where a loss of pressure in one service tank leaves the
vehicle with a limited number of reduced braking capacity
applications before the parking brakes automatically apply
and stay on.
In the event of a roadside inspection the system behavior
will be as follows: When the system is charged to governor
cut-out, and then one reservoir drain valve is opened, initially
both reservoir gauges will fall, however, the AD-IS® air dryer
and reservoir system primary and secondary pressure
protection valves will close at pressures above 70 psi,
protecting the remaining brake circuit from further loss of
TEMPORARY AIR DRYER AND RESERVOIR
To temporarily bypass the air dryer, the following procedure
needs to be followed:
Follow the Maintenance Precautions outlined elsewhere in
Make sure that all residual pressure has been released
and the air dryer purge reservoir has been drained to 0 p.s.i.,
then remove the air supply line from the compressor to the
inlet port (1/IN). Remove the safety valve from the AD-IS®
air dryer and reservoir system body (see Figure 1 for location).
Note that a short puff of trapped air may vent from the safety
valve port when the valve is being removed. Install a T-fitting
into the port. Using any adapters necessary, reinstall the
safety valve in one of the branches of the T-fitting. Using
any adapters necessary, install the air supply line into the
remaining T-fitting port. After testing the T-fitting for any air
leakage, by using a soap solution after charging to system
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