To finish off a disc brake bleeding session, top off the master cylinder with fluid and open the bleeder once you are confident that the bleeding is done. Then pry the brake pads back (open the caliper up) and pump the brake lever one more time, being sure to hold the lever in. Now close the bleeder and pump the lever until it has a good, strong feel. This technique will pop out any bubbles that have lodged themselves behind the caliper pistons during the bleeding process.