90 F150 Brakes

Please Help! Shoes, pads, and rotors have been replaced. Front brakes may not have been working (old pads had very little wear) and don't seem to work now. Rear brakes bled OK (pedal almost to the floor), but nothing comes out of the fronts. There are no visible leaks in the system, but the front rubber lines do look old and worn and will be replaced. Is there something obvious that I am missing? I do not know much about ABS-is there something there I need to check? Thanks

Rear brakes bled OK (pedal almost to the floor), but nothing comes out of the fronts. Is there something obvious that I am missing? I do not know much about ABS-is there something there I need to check? Thanks

The front bleeder valves may be plugged with dirt. Completely unscrew(remove) the bleeder screw and see if you can blow through it. If you can't blow through it, use the proper size drill bits to clean it out. A hole in the front and a small hole in the side.

If you can't get any fluid out after making sure the bleeder screw is open, something must be awry with the master cylinder.