Here are a couple of pictures of the Hall and OE rear brake lines. I tried a copper crush washer, and it improved but still leaking. I think it is as tight as possible without stripping the threads. I'm going to try a thicker crush washer to see i that helps. As you can see the Hall has an inverted flair and the OE is perfectly flat. The Hall version is .003" longer from the nut to the end of the flair.
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