Where does the additional vacuum pressure come from if the engine is off?
SMI 9599006 Stay-IN-Play Duo Towed Vehicle Braking System
Dinghy Towing Accessories
Question ID: 2930256 Status:
Open Oct 20, 2019 - 03:30 PM
1answer
Answer
Oct 22, 2019 - 07:31 AM
SMI taps into the vehicles vacuum lines & then the air compressor is a dual head pump that both creates air pressure & vacuum. This is how they replace the vacuum that they use from the vehicles vacuum booster. Let me know if you have any other questions.
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