try holding the disk and giving it a good pull outwards, mine just poped out that way i no its a differant car but sounds like the same with a l;ittle clip that holds it in , haynes told me to put a screwdriver in and bang it , but thats a load of crap .. a guy off here told me what iv told you and it came out real easy, and put it back in the same way, just feel for the splines and give it a gentle push forward..works a treat mate

andy