Originally posted by Doc Dave
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Sounds like the booster may not be venting properly, if atmospheric pressure can't flow freely into and out of the booster chamber, pressure will not be released. This is also dependent on the large piston return spring doing its job. If it isn't venting freely, the spring is not strong enough to overcome the trapped air. Trapped air sounds like the culprit here since the pressure leaked off within a few minutes. You might try it with a full open vent tube to test the action.
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