Bendix master vac power brake set up

67Dart273 said

You pretty much must have a check valve. If you are into the throttle, the engine vacuum drops, and if you need to grab the brakes before the engine can recover and generate vacuum, you will be faced with a panic stop and poor boost

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Maybe I'll pull this thing off and take some pics of it and let everyone see the valve, maybe even find a part number. Again it doesn't appear to be a valve, it appears to totally block the vacuum because the end the hose attaches to that goes to the booster appears to be sealed.