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I have two Motive pressure bleeders, and they really do work. I only use air pressure, and a big clamp, and add fluid as I go.
I'd try the Phoenix reverse bleeder, if I wanted to throw money at the problem again.
A big problem with our brakes is that you can suck air from so many places in the calipers if you try vacuum bleeding. The two-person method might work for a hydraulic clutch, but no one has the patience to do the 16 pistons that are in a C3.
I have my home-made pressure bleeder made out of a garden sprayer, tygon tubing, a pressure gauge, and compressed air fittings, aluminum plate, and big old c-clamp. I fill the sprayer with fluid and pressure bleed. Works like a dream. Works so well that I've actually flushed my brake system just because it was so easy. I pump it up to between 10 psig to 15ish psig and start bleeding; when it drops down between 5 to 10 psig, then I pump it up again and continue bleeding. Easy peasy lemon squeezy......
The trouble with any of those master bleeder adaptor lids whether aluminum, steel or fiber is, you can't see what's going on in the masters rez.
To avoid forcing the master to run dry, you constantly have to take the lid off for inspection.
Half inch Lexon plexiglass, cut to size and sold at home window shops allows you to see the fluid level.
It drills easily, is almost bullet proof and gives a visual aid "window".
A fitting, a gasket and a big clamp hold it in place.
Click on my avatar, see my photo album brake bleeding.