HELP brakes

[bagd88]

i've got a 2005 f250 6.0 i had to replace the passenger side rear caliper this week and i bleed the brakes and they still felt soft so i bled them all. it sill feels as though their is air in the lines because the pedal will go almost to the floor. i checked the master its good their are no leaks ive gone through 2 quarts of brake fluid bleeding them and ive had to live without my truck for a week.
any help would be greatly appreciated im pulling my hair out