Now I'm Stumped..
 

O.K. we did the complete brake job from new pads/rotors to new rear wheel cyl's. and shoes drums and hardware and now a new master cyl. (actually tried two of them) and we bleed the brakes. There are no leaks anywhere, nothing to do with the brake lines are showing any dampness.

The brake pedal still hits the floor. You pump it and it gets pressure and will hold it fine, it doesn't slowly go to the floor but as soon as you let go again and press down on the pedal it hits the floor and now the ABS light comes on.

I have no idea where to look now and I don't have a lot of hair to pull out anymore so if anyone has an idea I can chase I'd be very happy to give it a go.

Someone correct me if I'm wrong but I seem to remember reading in the Haynes manual about there being a special way to bleed the rear valve assembly for the ABS that needed a special tool/equipment.
It could be , even though you bled everything , that there is still air in that valve unit.
The 94 I used to own only had rear wheel ABS.That , I assume is true for your's.
I would pump the brakes a few times and bleed the rears again.
Start from the passenger side.

O.K. we will give that a try tomorrow and thankyou for the input.