I purchased a 2005 Beaver Monterey in Nov. 2015.
In order to reach drive mode at 120 psi, I have to pump the brake 2-3 times to get it up to about 120-130 psi. When driving in town or less than 30 mph, it will lose air pressure to about 70 psi or less. To bring it to up to 120 psi, again I have to pump the brake 2-3 times quickly. Freeway driving or speeds between 40-60 mph seems to hold at 120-130 psi. The air governor and air dryer have been replaced. No one has been able to figure this out. It has RoadMaster chassis and GoodYear air system. Thanks for any suggestions or solutions. Ed
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ED Sounds like a inversion valve leaking, park your coach chock front and rear of wheels start the engine build pressure to max release the park brake shut the engine down and listen for a air leak at the driver side rear wheel area.
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Walt & Will
2000 Dynasty
2017 Ram Big Horn Crew C 4X4 w/ M&G