Yes- - - -On the smaller (3/8") vacuum lines I use plastic check valves that plug into grommets in firewall mounted brake boosters. I believe there's a spring loaded brass check valve that's used for bigger lines. That allows the vacuum in the reservoir to stay there for a couple of powered brake applications if the engine stalls. I use a small hole saw to pierce the tank to install the grommets.

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Jerry

Last edited by Hotrod Lincoln; 12/31/2024 3:00 AM.
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