Take both bleed bolts out, and submerge it in water. (bath/sink) 1. Cover one hole, and pull the lever. 2. Hold the lever blade down, and cover the other hole. 3. Release the lever. Then repeat step one, and do it untill you're happy. This will pull the lever through the system, then kick the air out at the other end. Just make sure the lever you 'push' the air out of is higher than the other bleed hole. - Because air is lighter than water, so it will float upwards through the system.