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Double line vacuum brake check valve

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    Double line vacuum brake check valve

    Is this an ix thing? Why have one pull pre throttle and one post?
    AWD > RWD

    #2
    I don't know. Some of them came with one and some came with two and the other is blocked off. The ix booster is different so maybe it works better with 2 lines?
    Build thread

    Bimmerlabs

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      #3
      I ended up using a Dorman BMW/GM universal part. One in, one out. It was $5 at autozone. I opened up one of the gaskets it came with and plugged it straight into the booster. Works great. Brakes don't feel any different and it simplified my ITB vacuum routing.
      AWD > RWD

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