It might be a dumb theory, but I get the sense that adjustable proportioning valves make effective bleeding much more difficult, especially if the valve is set to close off one end of the system when you're bleeding. I say this because I've only had problems bleeding systems that have adjustable proportioning valves. With my current system (mostly new steel lines/bends/masters/pedal), which has no adjustable valve (dual masters with balance bar instead), basic gravity bleeding actually worked the first time (as far as I can tell at this point). I was so happy to avoid that stupid compressor suction setup . . .
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