In reference to the debate, wouldn't mind adding my 2 cents worth.
In the shop I used to work in, we had "suckers and blowers" too.
I'm most familiar with the pressurization at the master. The apparatus was a 2
chambered affair. The brake fluid is added to the upper chamber, the lower
chamber is pressurized with air, a diaphragm seperates the upper and lower
chamber. To do a brake fluid replacement (which is recommended every 2 years
by many of the pricier car manufacturers), the reservoir is emptied and filled
with new brake fluid. The bleeder then attaches to the master cyl reservoir
and the lower chamber pressurized, this was the type I usually used as the
bleeder keeps the reservoir full. Had a pretty good capacity, so running out
of the fluid was pretty hard to do, unless no one refills the bleeder. Upper
chamber held a quart or two of fluid. Problem on a typical spridget would be
to make up an adapter to attach to the master. The later ones with 2 single
masters probably a more common size.
The vacuum ones hooked up to an air hose and created vacuum via a venturi,
also had a container, similar to a Mityvac, to hold the old fluid. BIG
drawback was had to keep the reservoir full, hassle.
When I had the clutch fork problem last summer on my Sprite, I couldn't figure
out why I couldn't get the clutch bled of air. I think there has to be a
little "push" back on the slave piston to get all the air out. The piston was
always going out to the circlip, which it won't do apparently if the clutch
fork isn't bent.
Dan
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