"Bleeding Maguras in a bucket or a bath Fill the bucket or the bath full of water. Take the brake off of your bike and put it in the bucket/bath. Undo both bleed bolts, the one on the lever and the one on the slave. (Underwater) The method is tricky at first, but once you have the rhythm, it will take a minute at maximum. Underwater: hold your finger over the hole on the slave cylinder (remember, when you have your finger on the hole, make sure it is tight and sealed against the hole, other wise it will take longer to bleed and may effect performance), press the lever all the way down, then hold your finger over the hole on the lever body, take your finger off the hole on the slave cylinder and release the lever fully, repeat until you no longer see any air coming out. Do up both of the bleed bolts. (Again, underwater) Take the brake out and it should be air free." BOLD.