When i bleed my brakes i use a jar and a tube and only open the bleed valve 3/4 turn. if it's open too much air seeps back into the system through the threads. I position the master cyl. on the front brake with the bars to the left lock. This keeps the banjo fitting lower than the fluid in the master cyl and will eliminate a high spot in the system and makes sure there is no pocket of air bubbles. Also push the pistons back into the caliper. I've done the gravity feed and it works as does the pumping method. Sometimes if you have a lot of air in the system you can close the nipple and pump the lever then crack the nipple open and watch the air push out under pressure. I also have a vacuum bleeder that works well too.
