Closed bottle, single person brake bleeder method discussion
 

Hey guys, I had a debate with a friend of mine regarding the single bottle, single person brake bleeding method as outlined in this youtube video:

[ame]http://www.youtube.com/watch?v=MfTmlOZbXgs[/ame]

He pointed out a problem with using this method in that while it might be OK for partial bleeds to remove air from the end of the brake line, it wouldn't do anything for air trapped further up in the hard lines that too far back to be pressed out with a single push. I've made a diagram in paint to describe what he is talking about:

http://i1299.photobucket.com/albums/...pszq39ymnr.jpg

I completely see the logic in what he is saying but I'm not convinced he is right but I don't have the knowledge required to explain why. I say this because if he WAS right, after the first press of the brake pedal, I imagine you would never get more brake fluid to come out but I've used this method many times and I can fill the bottle if I want to, so I think the fluid has to be moving forward in this case and any air bubbles in it would be moving as well but he isn't convinced that is the case. Unfortunately, neither of us know enough about our master cylinder to explain how it would work or not work. I've done plenty of reading about master cylinders and I have a good idea of how they work but I'm still not any closer to understanding how either of us would be right or wrong. Then I also have this crazy idea that I'm not sure an air bubble would really get stuck at that point in the brake line, I imagine it would either work its way back to the master cylinder and out to the reservoir or hang out next to the caliper bleed screw.

So finally, is the method outlined in that video no good for a proper bleed or would it actually still work? Could someone with more knowledge or understanding explain how this actually works?