there are 2 methods submerged method Unscrew the grub screw in the lever and do the same with the screw on the piston, unscrew the TPA all the way out, submerge the brake in a bath and pump water though the brake with the lever till you are shore that it is completely full of water with no air. finally put both screw back in making sure the pistons are still submurgerd, make sure the screws are really tight, lift out and its ready to go on your bike. Bleed kit method You will need a bleeding kit for this which i would recommend getting from ebay or tartybikes. the start is the same as the 1st method unscrew the screws. with the bleeding kit you will get 2 bits of hosing with little adaptor screws on them, screw these into the lever and piston. fill the suringe you get with water or oil and get someone to stand at the back of the bike ready to put there thumb over the hosing. fit the syringe onto the hosing on the lever and pump water though the brake till the water flowing out of the piston is bubble free, once bubble free get the second person to place there thumb over the hosing. now screw the grub screw into the lever and because of the pressure the second person with be able to take there thumb off. screw in the screw in the piston and your ready to go. Mr ?