Hey Mike, although I am not familiar with your unit as an old 18 wheeler driver, locate your air tanks. Look around them you should see a small cable, lanyard, hooked to a valve located on a low point on the tank. Ensure the system is charged, has air indicated by your gauge on the dash.
Pull the lanyard and you should hear and see air and any moisture excape from the tank. Your unit should also have a what we called a spitter, an air dryer/filter, it is a large cannister type unit, and when your air builds to the cutoff point, you will hear it discharge, spit, this also removes moisture from the system.
Hope this helps someone else may chime in that has your unit.
Drive safe
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Jim and Bonnie Haney, MGySgt 30 years, Ham Radio N0LZS
2004 Brave, 34D, 8.1L
toad 2019 Jeep Wrangler Unlimited
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