Brake line oops

I wouldn't fool with junkyard brake tubing unless you live in SoCal or Phoenix. You need a quality double-flaring tool as shown. I have made double-flares OK on the newer "metric" brake tubing (from junkyard car in CA), so it must be close enough to the 1/8" tubing. I used it for its flexible stainless wire-braid sections at the master cylinder. You can actually make bubble-flares with a double-flaring tool, as I did to use a later MC on my Mopars. You just use the flat-side of the bar to make the single flare (see youtubes). You can buy a special bubble-flare tool, but expensive. The Cu-Ni tubing sounds great, but I have never had much trouble flaring steel tubing, if you keep the clamping bar very tight so the tube can't slip (use a wrench, not just the thumb screw). Stainless tubing may be harder, though I recall that is what the metric tubing I used was. As an aside, I have read that the spiral steel wrap over the brake tubing was so the workers could hand-bend the tubing tightly around the frame rails without kinking (using leather gloves). Others say it was protection from rock strikes. Perhaps it was for both.