Like I said I have not had any luck with it. A friend who has a blacktoping business told me about it awhile back. I used to do it with his truck years back, he dont work on his trucks anymore so he dont do it anymore. but he said something like, you hook everything up and crack open the bleeder valve and hang the caliper up on the frame or something and let it sit, he said sometimes over night, and gravity fills the caliper and forces the air out of the system. Sounded goofy to me and Like I said I have not had any luck with it and have asked around about it and people actually did this and they say it worked. I have never heard of it either until recently.