Ok so got a problem, my 55 210 has disks up front and drums back I found a bad spot in the line leading back to the rear and replaced the bad section also found one bad wheel cylinder driver side rear and replaced that so my next I got a friend to help bleed the rear system. Hear is my problem, after going through the bleeding process (person in car pumps pedal 3 times then holds it down then I open bleeder to let air out then close it then he would release pedal ) this we did and I have gone through at least a quart and still getting air !! We have checked all the fittings and found nothing, what the heck I am missing ??? FYI: this car is equipped with a booster and proportioning valve but I don't think that has anything to do with the problem, any help would be greatly appreciated. 55 brake setup.jpeg