Stop in for a cup of coffee

Mattax said

Inverted flare fittings seal between the face of the flare and the seat on the fitting.
The threaded nut provides the mechanical force squeezing the two together.
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I can't picture any NPT fittings on the brake system, but maybe I'm forgetting one. Maybe the safety switch.

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ok, I know the problem now.
I thought the flare looked at little odd: one side is longer than the other, I think it might be squeezing it off kilter juuuuuuuuust slightly not to mess with it threading in wrong.
I will try and seat it better and see if that is what is going on.