Assuming the 25 PSI was with the engine running.
Make sure the drain valve for the wet tank is closed. Most often mounted under coach ahead of rear axle driver side.
A search for air drier bypass will probably lead you to the bypass kit and you can air up and drive. It is 3 fittings.
I would do a search on the forum for air dryer failure and contamination. Rich
Upon Doug's suggestion I checked the drain valve and it was closed. Quickly opened and shut it to find a burst of chalky air.
Hope all had a Happy Thanksgiving holiday.Not much time for me to do much troubleshooting as the forces of TG were too strong.Quick Update: I checked the air drier and did not feel any air...
Getting the air dryer replaced at any heavy duty truck shop will likely solve most of your problems. This kind of work is well within the skill set of most HD mechanics. You can buy...