Quote:
Originally Posted by autozen
The only caveat I can offer here is not to open the bleed screw too much, because it will suck air through the threads which will look like air in the system.
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No.. the line has pressure from the bulb PSI , so there is no suction side vac as long as you see flow...
.. which is why a vac pump on the caliper bleed line is an inferior way to bleed , as that will result in air entering the bleeder threads, as you suggest.
This will not happen with a pressure system as long there is PSI pressure from the pump. If the bleeder is open too far , the results on this system will be fluid coming out the bleeder threads , not air entering ..
..which is why we want to see flow rate at all times.[ thus the clear hose concept]