One of my 'birds has new steel lines too, and I replaced the entire rear brake assemblies. I went to loosen the bleeder screw to bleed the original fronts (temporary, before replacing everything), and I cannot even pull fluid with the vacuum pump from the bleeder. Fluid runs freely from the steel line just above the rubber. The rubber lines are internally collapsed. Firm, full pedal, too. In fact, it just about stops halfway down since the front wheel cylinders don't expand. Shiny and tidy does not mean it works right.