The Speedi-Bleed fills the reservoir as fluid is used, which is great. Check it out at
www.falcotools.com , this is the one I use. You want to use as low a pressure as possible to avoid problems. The most common problem is the 2 rubber caps on the master cylinder reservoir get hardened and cracked with age, and leak - sometimes badly - when under 15-30psi pressure! It's a good idea to just install new ones before bleeding, if yours are over ~10 years old (they're probably original unless you have replaced them already!)