Brake Bleeding Problems

[Mainehazmt]

1999 gmc sierra 1500 4x4 5.3

3 days ago I heard a growling in the rear of the truck no problem needed pads replaced the pads easy job (note needs new rotors asap) well as soon as I started the truck 1 line blew from abs pump (under cab left side) replaced with 5/16s tubing as the threads all fit where they went from master cly to the pump well the other pipes ended up failing and in the process the valve body got stripped found one local junk yard that was (good) but the issue is I can get no brake pressure after bleeding all the lines Is the tubing too big? must I have a mech somehow do the computer deal to get the ABS motor to spin Ive got pure fluid at all the wheels Im in the process of loosing my mind Help Please! PS I dont see leaks anywhere