Are you talking about the replacement bleeder nipples that have the little spring loaded ball inside? Sometimes those work, and sometimes they don't... if that's what you are referring to,
I have read several accounts where people take grease and apply it around the base of those bleeders to keep air from being sucked back in through the threads, while bleeding the brakes. I haven't tried this method yet.
Perhaps you need to bleed your master cylinder again, if you're not getting fluid at the wheel cylinders?
