Losing rear air pressure

Dave Merchant wrote:
I just took my 2003 Winne Journey (Freightliner chassis) out of storage after a 2 yr hiatus. I've been just driving it locally to make sure everything still works. Today, the rear pressure gauge dropped to zero immediately, stayed that way a minute or 2, then came back up to full pressure just as quickly as it dropped. I couldn't hear anything from inside, not sure I'd have heard it if I were outside due to the engine noise. Is it possibly a sensor issue? Even sitting still, just idling, it did it once, still couldn't hear any air escaping. I'd have to believe you could if it was being released that fast. Any suggestions?