I have used syringes before with no success, so I splashed out and bought a vacuum pump designed to bleed brakes and it works a treat. I loaned it to Aaron to bleed a brake on a Kato 65 he was having trouble bleeding and it worked a treat again. I think it cost me about $90-00, but it payed for it self already by not having to pay my local mechanic to do it. Hope this helps.
Buzz