bleeding ford explorer clutch system and can not get a firm pedal?

This can be tricky. Did you bench bleed the master first? You may have to wait over night for the bubbles to settle. Most shops pressure bleed the systems, but there is no reason that you should be getting no pressure. Pump the pedal vigorously and hold and re-bleed the slave. Do this many times. Also pump it up and hold it and crack the line loose at the master just enough to get the air out. This may take many times. Never let up on the pedal until the bleeder is closed. There are also hand held vacuum pumps that are available at most auto parts stores that may help.

hey ted's answer is spot on another idea run side, where clutch master; higher ( like on ramp) where its above the other 3 wheels and leave overnight and let bubbles all come to one location, sounds as if air all through system without useing the pressure system , high priced garages use; good luck