Soft pedal first push

Cars on blocks. Rear rotor held tight with lug nuts. Push rod moves free in the car and out of it. Plugged the master cylinder ports with brass plugs after bleeding. Hard, no bleed down in the car and out. BUT. You know what? And I hate to say it but the lines are backwards if the rear port is for the front brakes. Won't be able to try for a few days, work calls. I'll swap them and give it a try. Will let everyone know. Will be very relieved if it's this, no matter how embarrassing! Thanks very much!