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My mistake on the FMTV. The air supply valve for the trailer is on the dash. So, it makes them easier to purge. Just push the air valve on the dash, as in supplying a trailer with air, then apply the treadle valve. Pull dash air valve out and your done. Disclaimer. I have a “little” bit of...

1. On a vehicle with a well-functioning air dryer you shouldn’t see any water when draining the air tanks. And just to clarify there are several air tanks in the system. The air comes from the compressor cooling somewhat as it reaches the dryer. The dryer then filters any oil out and condenses...

The symptom described sounds like moisture in the air system. To get some of the moisture out as Suprman has posted warming up the system is a place to start. With the truck running open the petcocks on the air tanks to drain them down, then close the valves. Allow them to refill and repeat the...