| http://www.w3.org/ns/prov#value | - Go back and reread my reply to your original post.As far as the check valve goes,it is a one way valve that retains vacuum after a stalling event.This allows you to stop the vehicle with assist without manifold vacuum present.After running the engine and then shutting down you should hear an audible hiss from the booster when the check valve is slowing removed.try it again.
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