You must have got a faulty unit. I've had mine for a long time and bled many many sets of brakes. By far the easiest way to bleed. I absolutely couldn't stand the vacuum bleeders, they always leaked and you need a compressor to use them. I went through a gallon of brake fluid the last time I used one because it kept sucking air at the bleeder and I couldn't tell if the brakes still had air in the lines. If you would have used a vac on that leaker you would never have known where it was leaking because you would have kept pulling air in. After a gallon or two of fluid you'd still have air in the lines and been scratching your head.
Also, Wilwoods only need their stainless steel flex lines to connect them to your truck, but not to bleed them. They have regular bleeders like everyone else uses.
