New brake lines 68 GTS

The big thing on new line fittings is to hold the line so that is goes into its matching port straight on when first tightening. Some fittings, like at wheel cylinders have a longer nut that automatically holds the line straght into the matching port. But for connections like at proportioning valves and distribution blocks and hard-to-rubber line connections, the nuts are short and the line can be entiner the joint a bit cocked even with the nut threading right.

At these connections with short nuts, you need to be sure the hold the new line aligned straight in when first tightening so that the flare is centered on the matching port nipple; if you do so, you will not need anything for a good seal. We just replaced all lines on our '62 Dart; I did the backs while holding things straight. My son, with less experience, did the fronts......he did not hold the lines aligned straight when tightening. Guess where the 2 leaks were....?!? They finally sealed with repeated torquing to 'jesus, this is about the break' torque levels.....

WIth new hard lines, take the time to slightly re-bend the line connections so that they naturally lay into their matching port very straight and you will have good results.

Once a port is tightened with misalignment, then it is either re-flare or use something to seal up the distorted flare. I have not had to use any line gaskets, even with a number of car builds/re-builds (but I may need a couple for this car for piece of mind).