mbdemers, I had the same problem once. Just do this, after you bleed the slave cyl. and the master cyl. and the lines, just loosen the hydraulic line banjo-bolt that joints the line to the master cyl. and bleed there a couple of times. This will do it. I guess because thats the highest point, some air gets trapped there. Remember to wrap some paper towel there to keep the hyd oil away from the handlebar parts when bleeding it.
JT