Brush a few strokes, then give a small treat. Brush some more, say "good boy", give another crumb. Associate the treats and positive reinforcement with the grooming. Give a nice big treat and lots of love when you're finished. Start with a small brushing session, then add more each time.
Tapping the nose just makes the ritual more unpleasant. Respond appropriately if he really bites you hard, but generally positive works better than negative when it comes to training.
Chief comes to us for his brushing. We say "come here, you're gonna get brushed." We hold up the brush and he reluctantly comes over and allows the brushing, every day. We always finish with a treat.