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When the air pressure reaches cut out pressure, a pop-off valve opens up and releases air to bring it down to operating pressure. Cut out pressure is between 115 - 135 PSI in accordance with FVSS121... most manufacturers set their cut-out pressure for 125 PSI.
There are several of these valves... on the supply and service tanks, as well as in the brake system itself, as the brake chambers themselves are governed at 90 psi.
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