What I do is get a large syringe (50cc) with a section of tubing on it. Fill with fluid and purge the air out, hold vertical and allow any bubbles to escape. Clean the fitting on the slave cyl of all debri. Loosen the slave cyl fittting and remove the slave, compress the piston with a small clamp so fluid purges air from the fitting. The newer bikes have no retaining ring so the slave piston can eject from the slave body, be carefull when you remove it. Connect the syringe tubing to the slave fitting without introducing air, and just purge all the fluid through slowly. You will need a second syringe to draw fluid from the master cyl resevoir. When the fluid is clean and bubble free tighten the slave fitting. Install the slave and slowly pump the lever as you adjust the fluid level in the master cyl.
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