2wd, the front brakes never got used on this truck, because the back brakes did all the stopping. The rears are new, and front are new because never been used. I backed the tears off so much that the parking break barely works and the front brakes are starting to work.
That is an impossibility that the front brakes have never been used. The only way that they have never been used is, if the short rubber hose is plugged, there is an obstruction in the hard lines or if the MC is a two compartment and the cup is defective, or the brake line is pinched off.
An ABS braking system has nothing to do with how hard the brakes are applied, the ABS system only shifts the brakes from one side to the other when one side locks up, that's why when ABS is operating correctly, you feel kind of a rumble on the brake pedal.
I would replace the hose to both front wheels. Apply brakes and make sure you have brake fluid flow to each side, before connecting the hose up.
Since the PO has messed with the braking system, Lord knows what he may have done, specks of dirt getting into the system could raise havoc.
I'm not sure whether the 94 F250 has the proportioning valve on the rear brakes, if it has/had, it may have been deleted or misadjusted.
According to my manual, there is 45 pages of diagnostics for ABS systems.
