Charlie,
That is not normal. You could have a leak in your brake system, or the check valves between the brake system and the general air system could be leaking. You have two needles on the brake air guage. Are they both leaking down at the same rate?
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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