Just bleed the brake normally, just with water instead of Oil (Y) :D
In my opinion a water bleed feels nicer. :-
EDIT: Just found this :D
1.Fill bath
2.Submerge brake
3.Undo bleed bolts
4.Attach bleed tube, but don't bother with vent tube, no need!!
5.Fill syringe with water and put on bleed tube.
6.Bleed the brake as normal, **all underwater**
7.Do it a few times to really get rid of air.
8.Remove bleed tube and do back up bleed bolts. (Underwater)