brake problem 96 F250

[buss66]

Ok I'm relying on you smart people on this sight.

Yall helped me the other day with my clutch issue and I have it working now but now i have another issue.

We replaced the brakes on front and back and we still have a soft pedal that will go to the floor. I have bled them several times but it still doesn't seem to get any better. I replaced the Master cylinder today and rebled with my son pumping the pedal and holding it while i loosing the bleeder valve. I went aroung to each wheel at least 3 times and loosing the valve at least 3 times on each wheel each time but still no luck. Also my ABS light is on but i don't think that is why my brakes are soft. If i pump them they come up some but if i leave pressure on it will gradually go to the floor.

PLEASE HELP!

Thanks,