axle swap, now brakes are junk

[Imnewhere]

I have a 1996 mazda b 3000 4x4 5 speed. I also had a 1995 explorer 4x4 that shit the bed so I stole the rear 8.8 and abs pump out of the explorer and swap them into the Mazda

New parts:
front and rear calipers
front and rear rotors
all 4 pads
all brake hard lines and all 3 rubber hoses
(basically everthing but the master cylinder)

Before the swap the brakes worked fine. The Truck had a 7.5 drum brake rear.
I Have a motive products pressure bleeder so all the fluid is brand new and there is noo air in the lines after bleeding the whole system

I started the truck up and took it on a test drive and the brakes don't work right. the first 75% of the petal it just travels and nothing happens, then from there it gets firm but if you press it any further the brakes in the back just lock up and skid

anyone have a clue why the fronts seem to be not even trying to work? it seems like if you pump the petal after a few pumps it seems as though the fronts start to work but drive another mile and its back to bad petal travel and rears locking up

Im not much of a ford guy and these abs pumps have me confused I tried both the Mazdas and explorers abs pumps and bled real good between each swap but still n luck

Any body do this swap and have the same problem and have a solution??
Thanks

 

[RangerSVT]

Are you sure you dont have the front and rear lines crossed between the master cylinder and the abs pump?

SVT

 

[baddis]

is there a proportioning valve for the abs disc rear end? I know that disc doesn't use as much pressure as drum brakes

 

[Imnewhere]

The lines from the master are right I never changed those, they are different size and I check a diagram to make sure

And I don't see any proportioning divice other then the abs pump itself and I'm using one from an explorer (designed for rear disc)

 

[RangerSVT]

I'd try swapping the front & rear inputs at the abs pump, sounds like the rears are doing 70% of the braking, which is what the fronts are supposed to be doing...

SVT