Fairly sure I've read before that these are a complete pig to get the air out of. Try searching renault forums for help.

Have you tried opening the bleed nipple on the slave cylinder and letting gravity bleed it?

There is an old bike mechanic trick that may work,a decent sized syringe filled with brake fluid.,clear the air out like you see Dr's ontv do an connect to the bleeder and slowly plunge the syringe,master cap off,

Theory is the fluid and air in it are pushed UP and back through the system into the master ,never seen this fail,some bike master cyl's are really small and bleeding can take for ever.