Livestock syringe is just a bigger version of the plastic syringe like they give with kid's medicine these days. tractor supply, local feed and grain stores etc.
Been there and done that with all the bleeder attempts you mention. the small size of the lines and orifices in the master, makes the suction pull air around the threads rather than fluid through the lines because the air can move thru more easily than the fluid can thru the lines.
pumping fluid in reverse through the system is the way to go. syringe and a clear piece of hose. empty the reservoir and watch it as it fills while your pumping the fluid in at the caliper. just have to be careful when filling the syringe that you draw any air out of the hose, up into the syringe, then have it pointing straight down so that you don't pump it back into the system.
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