BRAKES losing presure! any ideas

[timgco]

Document every time it has failed. Since this a safety issue, and you local dealer cannot duplicate it, this is one of those times you may want to get the factory rep involved. I cannot tell from the avatar, but it looks like you might be lifted????? IF that's the case, check your added breaklines. I had a similar experience with a lifted truck last year. It turned out to be on the fitting was bad AND that same line had swelling also. It was ready to go but not obvious at first glance. ...just a thought.