90scmn12 do you mean a vacume bleeder? if so it is very possible that you are pulling air around the bleeder screw threads, especially if the bubbles are very tiny. you may try removing the bleeder screws and wrapping them in teflon tape, then reinstal them. the next option would be to get a third foot and bleed with a helper, or lastly make a bleeder bottle from oh lets say an old brake fluid bottle or a canning jar by taking the lid of the container poke a hole in it. then insert a length of tubing with enough brake fluid in the container to submerge the end of the tubing. hook up to the bleeder screw and pump away. (maybe ten strokes then check the master cylinder level) hope this helps.