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FIGURE 6 - BENDIX

AD-IS

ROADSIDE INSPECTION

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 Bendix

AD-IS

air dryer primary and secondary

pressure protection valves will close at pressures above

70 psi, protecting the remaining brake circuit from further

loss of pressure.

TEMPORARY AIR DRYER AND RESERVOIR

SYSTEM BYPASS

To temporarily bypass the air dryer, follow these procedures:

Adhere to the General Safety Guidelines outlined

elsewhere in this document.

Make sure that all residual pressure has been released and

the air dryer purge reservoir has been drained to 0 psi,

then remove the air supply line from the compressor to the

inlet port (1/IN). Remove the safety valve from the Bendix

AD-IS air dryer (see Figure 1 for location). Note that a short

puff of trapped air may vent from the safety valve port when

removing the valve. Install a T-ﬁ tting into the port. Using

any adapters necessary, reinstall the safety valve in one of

the branches of the T-ﬁ tting. Using any adapters necessary,

install the air supply line into the remaining T-ﬁ tting port.

SMALL

O-RING

CHECK VALVE

BODY

SPRING

AIR DRYER AND RESERVOIR SYSTEM DELIVERY CHECK VALVE

GOVERNOR GASKET

(SPECIAL GASKET,

SEE ASSEMBLY NOTE 6)

LARGE

O-RING

ADAPTER

After testing the T-ﬁ tting for any air leakage—by using a

soap solution after charging to system cut-out pressure (a

1" bubble in 10 seconds is acceptable)—the vehicle may

be returned to temporary service.

Note: This is a temporary bypass of the air dryer. Full

repair of the unit must be carried out at the earliest

opportunity. With the air dryer removed from the system,

contaminants will be entering the air brake system:

reservoirs will need to be manually drained daily until the

repairs are completed. At the end of each working day,

park the vehicle and slowly drain pressure through the

drain valves—leave open to the atmosphere—for several

hours, if possible. When repairs are carried out, be sure

to check that all reservoirs (including the air dryer purge

reservoir) are emptied of all contaminants.

If, after bypassing the air dryer and reservoir system, the

system pressure still does not build, use the following

procedure to remove, clean, and reinstall the delivery

check valve.

GOVERNOR

(NON-ADJUSTABLE,

130 PSI CUT-OUT)

BOLTS