Actually, there is now a 4th type which is touted as being the absolute
best at removing stubborn air from the lines.
It is a hand pumped reverse-bleed system. That's right, it sends the fluid
UP, in the normal direction of an air bubble, back into the master cylinder.
Sounds logical in theory, anyway. But not a cheap unit, and they have several
versions for "occasional" or "constant" (professional) use.
I saw it in a trade magazine while I was waiting for an exhaust installation
at a muffler shop.
Alan
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