Well, I've tried everything I know to get brake fluid into the front dual brake setup, with no joy. First I filled the calipers, then the two brake hoses from the junction to the calipers, then the hose from the master cylinder to the junction. There is fluid in the master cylinder covering the hole in the bottom. Working the lever causes rippling of fluid in the master cylinder, and there is maybe a little resistance. But, not matter how much I work the lever, or even if I try to power suck fluid through the bleed valves using an air compression brake bleed tool, I get no fluid or air. It's the weirdest thing I've ever seen.