do as you would bleeding the brakes..resevoir cap off ,bleed futhest nipple from resevoir first, till resevoir is on lowest level,,then top up with new fluid to max ,then bleed same nipple again till new clean fluid appears..then lock nipple and move on to next furthest nipple ,top up resivoir to max and bleed that one till new fluid comes through ,keep check on resevoir, lock when new fluid come through ,check resevoir ,then move ont to next furthest from resevoir bleed till new fluid comes through,lock.. check /top up resevoir then bleed last nipple till new clean fluid comes through.top up resevoir to max level , try brakes .....job done..