I've tried a few things to get it to work. One, to get it to feed all the way to the caliper (if it isn't pouring out when you squeeze) is to remove the bleeder and plug the hole with your finger. Pull the handle for suction, then let go and repeat. If it's dual disc, I do it at the splitter. You can also take a syringe and try feeding some fluid into the caliper end. If it's just the air, you can take a zip tie and tighten the lever down to the throttle and let it sit overnight. I had to do that 750f that way to get it to finally work. I got the fluid clean to the splitter, then I got it clean to one side, then clean to the other. It took a while.