Update. I got the tubing with the grey coating. POLY ARMOUR steel tubing is the name of the product, got it at Advance Auto. Good stuff, the coating is flexible enough that it does not chip or flake when bent. The tubing took a double flare wonderfully, looks real nice. Having a quality tool always makes the job go smoother.

Up to this point, I thought I had a piece of crud in the lines acting as a check valve, which is why the brakes locked up. BUT.. I found the real culprit. the Ebrake cable on the drivers side was rusted up in its sleeve. Aslo, the springs and other brake hardware is shot.

I'm gonna have better than 1500$ in these dam brakes before I am thru...