[Shootnride]

Dave,

You are absolutely correct in that none of the sealing in brake fittings is done with the threads. When I commented about the copper seat gasket interfering with the threads, my concern was that if it was a little too large, it could be tilted out of alignment with the flare before the fitting was tightened. You mentioned that the flare on your old brake line was deformed. That is generally a sign of over-tightening. Many brake system leaks are caused by over tightening of the fittings. The flare on the hose or steel brake line will deform very slightly to form a good seal, but that deformation should be almost imperceptible. I have found that it is best to tighten flare fittings the least amount possible to accomplish a leak free connection and tighten in very small increments as needed. Once a flare has been over tightened, it's usually ruined. Those little copper flare gaskets will help to accomplish a good seal with minimal tightening.

Ted