Ford Repair: brakes, power brake booster, drum brakes

Question
I have a 95 ford e-150 van 5.8v-8 auto the othe day the brakes went out I replace the master cyclender, power brake booster the petal still go to the floor, we have bleed the system 3 times and even took the mas.cyc. off and bench bleed it checked the hoses they are ok what could it be?

Answer
brake booster wouldn't make pedal go to floor it would make pedal hard

anything hydraulic would make pedal go to floor-master cylinder-calipers and wheel cylinders being most common-if air is out of system and pedal is still going to floor you should be able to see a leak somewhere-if you bought a cheap master cylinder or are bleeding it improperly you may never get a pedal. first the master cylinder probably came with two hoses and fittings i usually mount one ear in the vise-fill resevoir with fluid connect hoses and put ends in fluid in resevoir then push repeatedly about i inch in then release until all air bubbles are gone if they never disappear you may have defective cylinder-then i mount in vehicle and fill it-then go to rt rear open bleeder and let sit until fluid comes out make sure master cylinder stays full-let bleeder stay open 3-5 minutes-then close bleeder go to each wheel in order rr/lf/lr/rf do the same for each then you should have pedal. if you have drum brakes on rear make sure they are adjusted and are in good condition. follow up if need to.