Rabbits shed 4 times a year with spring and fall being the extreme. I found this video from YouTube user 101rabbits about how to groom your rabbit. She has some good suggestions and ways to get the loose hair even without a brush! With a big molt looming on the horizon, take a look at this video to prepare yourself!
Looking for a good shedding comb? Cat and dog combs work well (there are few options labeled for rabbits). Check out some great options here (be sure to read the reviews!): Click Here