I didn't know anything about the brake lines.
My 84 would have soft brakes one day and be fine the next.
I finally pushed real hard on the brake pedal and
broke the rusting spot in the line open and they leaked much more.
At least I found the problem.  I got some premade sections of
brake line at Napa and bent them into shape.  It took two and
a coupler.  Now I just have to bleed all the air out.
Wait, first I have to get the bleeder valves open.
They are totally rusted shut.  Will have to replace the wheel
cylinders on a couple of them.  I'll be sure to use
never seize this time!