firstly scrap the pressure bleeder, in my opinion they are shite. the best way is to get your mate in the drivers seat and pump the pedal, after ten or so pumps with the nipple open, close it and and when the pedal is to the floor then open the nipple, wait for the fluid to cum through then close the nipple and get him to lift off, this was no air gets back into the system.

also dont drain the resisvoir, just bleed sum out, then check and top up, then bleed and so on

you prob already know this but its here anyway