With a helper pressing on brake pedal, crack nut on line at master cylinder going to rear brakes. If pedal drops and fluid is expelled then move on down the line until you find the blockage.helper doesent have to push hard, just some.
^^THIS^^. You must bench bleed the master. I would do above except start "in the middle" someplace with a helper. Either crack the rear line at the prop valve/ distro block or at the rear axle and work forward or backward from there.
