brake bleeding

[junia]

I need to make sure I'm doing this right because this is the second time I'm bleeding the brakes and the breaks work for a while but then they get spongy after a day.  When I bleed my brakes I have a friend pump my brakes a bout 4 or 5 times until they get hard to push down and then I open the bleeder valve and then close it before the pedal gets all the way to the bottom.  I do that a few times on each brake until I do all four.  Maybe I'm doing something wrong that maybe someone could correct me.  Also,  if anyone is wondering I make sure that I don't run out of brake fluid in the master cylinder.  How does that oneman bleeder work??