That style of slave cylinder is a pain in the butt to bleed. I have done one so far, and the best method I have found for them is to elevate the slave above the master somehow, and then bleed it uphill. Really awkward to do without a bleed screw too. Another method that worked fairly well was to set the slave on a rack or tray over something to collect dripping brake fluid, crack the banjo just enough to start a slow leak, and gravity bleed it. This method takes forever though.
In either case, pre-filling the slave with a bit of fluid and cycling it a little to get the air out will help immensely.
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