Air Brakes - Drain Sound

[Stephen H]

I noticed that most other 'birds air brakes make that "pssshhh' air
release sound every few seconds while idling. Mine does not. I went
under the old bird, and found a "Bendix" device under my wet tank. I
removed it, disassembled it, and cleaned well, and re-assembled it. I
have yet to try starting the old bird to see if this fixed it.
(radiator out being soldered) Is this the device that does that? On
the unit it says "push pin to manually drain" Also do you know if
there is a air drier? If so, where would it be located? I would like
to change the filters, ect.
Thank you
Stephen
81 FC-33SB
Plant City, FL