Those brushes with thin metal bristles shouild never be used on a rabbit. Rabbits have very delicate skin that tear and cuts easily and rabbits have a lousey immune system (to heal those cuts). A lot of rabbit owners just use their hands and gently tug at the fur, others use a damp cloth (the dampness helps prevent the fur from flying all over the room), I use a flea comb. Yes they have metal teeth, but they are thick and have a rounded tips so they don't puncture the skin. Tug gently and the hair will comeout easily.

Ash, I'll be in touch in a few minutes, I was away from the office W-Th-F last week.