Have you managed to work out why he's biting? My bub (now 9 mnths) has been biring for about 2 mnths on and off, and it took me ages to work out it was a combination of teething and my letdown not being fast enough for him! Tried the "no" and taking away methods, didn't work for me. I agree with hippie Kiwi above, the "smother slightly with breast method" works best (sounds ridiculous, if you ring the ABA helpline on 18006862686 they will explain it). Didn't stop the problem for me, but it has greatly lessened it and I can now tell when it's likely to happen (teeth pain or slow letdown at the end of the day) so can be prepared. My partner suggested I wean, but after all the pain I've been through to get to this point, no way, not without a fight! I also really find that when bub is tired and I'm tired, I lie him on his back and I feed him kneeing on all fours over the top of him (which looks rather bizarre when I'm feeding him in a park in public, but oh well) andit really seems to help re lack of biting because the milk is flowing out much faster.
Hang in there and good luck!