of air should occur from the exhaust port of the drain
valve. If no air comes out, push the wire stem lo-
cated inside the exhaust port. If no air comes out
after pushing the wire stem, there may be a plugged
filter in the adapter which should be replaced.
If the drain valve does not function properly, repair or
replace it. See Section 42.14 of the Severe Duty
Workshop Manual.
Leakage Test
Perform the following test after repairing or replacing
the DV-2 valve, to ensure that the valve is function-
ing properly.
With the system charged and pressure stabilized in
the system, there should be no leaks at the drain
valve exhaust port. A constant slight exhaust of air at
the drain valve exhaust port could be caused by ex-
cessive leakage in the air brake system.
If the drain valve is leaking excessively, repair or re-
place it. See Section 42.14 of the Severe Duty
Workshop Manual.
Brakes 42
108SD and 114SD Maintenance Manual, October 2019 42/19
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