Where does the additional vacuum pressure come from if the engine is off? (SMI 9599006 Stay-IN-Play Duo Towed Vehicle Braking System)

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SMI 9599006 Stay-IN-Play Duo Towed Vehicle Braking System Questions & Answers

SMI 9599006 Stay-IN-Play Duo Towed Vehicle Braking System

The SMI 9599006 Stay In Play Duo is one of the most unique braking systems on the market today.

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