First use your syringe to pump a good amount of water through thus getting rid of old oil. Now get yourself a bucket of water, submerge your whole brake set then whilst under the water take your bleed bolt off the brake cylinder and pump your lever a good few times. Replace your bolt (still under the water) then repeat with the brake lever. Bolt out, pump your lever a good few times, bolt back in. All the time keeping your ENTIRE brake set under the water. works for me.