There must be pressure at the bleed nipple when brake is pressed !!
If not bleed MASTER CYLINDER FIRST, then blow out the lines in case some crap is in there, once disconnected from calipers.
It is basic mechanics, fluid is NOT COMPRESSABLE, so movement at master will create movement further down the line.
It is entirely feasable that the pistons are jammed in the calipers as this does happen (to fords in particular), lok for movement whiule someone else presses the pedal, or trek over to me and I'll fix it!!
tabetha