The Brake Line has a short on one end and a long screw on the other what end goes into the Brake Cylinder, or does it not matter
i think they are made one long and one short nut for this reason: i have found with some wheel cylinders the short one has the threads bottom out before the inverted flare is tight
I have run into situations where I could not get a wrench on the short one to tighten it when it recesses into the cylinder too deeply.