The pressure bleeders are great, but if there is a little leak at the connection to the master, you can end up with a mess.
I start by removing most of the fluid in the master, then hook up the pressure bleeder. Since the pressure bleeder adds fluid, the master won't run dry. Then keep and eye on the fluid level in the master if it slowly goes up, then there is a air leak at the connection to the master and there will soon be a mess. Bleed off the pressure and try to fix the leak. Also use the smallest amount of pressure needed, doesn't take very much pressure to work.
Some of the tilton master tanks will not seal up perfectly with the seal on the cap that connects to the pressure bleeder.
I tried using the vacumm type once, I was getting air leaks at the bleeder so that didn't work. But others have had good luck with that type.