I just finished doing this pain in the butt job,,I tried the gravity bleed along with the vacumn bleeding gizmo,,It didnt work , just get someone to pump the brakes and bleed them one by one,,do the passenger rear 1st, the drivers rear next, the passenger front and then the drivers front, dont 4get to bleed the lines between the master cylinder and the proportional valve,, it takes a little time but it works,, good luck, rd