I have a 1983 f-150, 4x4 regular cab with a long bed. I am taking the brake line off. It runs from the rear of the cab, to the rear axel. What sizes are the nuts on the line? 7/16 is too small, and 1/2 is too big. What could it be. They don't make a 15/32 flare wrench, do they? Please help.

Ford dude

 

Ford Dude ,
Either rust has built up on the nuts or the nuts are rounded off a little ? Spray them with some PB Plaster , let it sit for a few mins . If the nuts are rounded off a little you may have to use a small pair of vise grips to break them loose