Use a vacuum pump at each bleeder to draw fluid into the system, you must have someone hold the brake pedal down or fluid will now flow while doing this. Once the system is full try it and see how it works, sounds like you have one mother of an airlock. Suction is the only way to get the system primed.
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”
— Han Solo