Unless you have a newer style master cylinder there is no need to bench bleed the stock AD master cylinder. When you say new, do you mean "New"? Are you sure your keeping the fluid level up to the top in the master cylinder? You may have to refill it a half dozen or more times to get all the air out of the lines, and make sure your not running it dry or you will just pump more air into the lines and be starting all over again. Who is helping you bleed the lines? are you sure your following the proper bleeding procedure?
Denny Graham
Sandwich, IL

Denny G
Sandwich, IL