mine did the same thing a while back and replaced it with the bit darrsi mentioned.
works a treat now
with care you don't need to take the front wheel right out, just drop it enough to get at the thing.
http://foc-u.co.uk/index.php/topic,6530....l#msg61100
works a treat now

with care you don't need to take the front wheel right out, just drop it enough to get at the thing.
http://foc-u.co.uk/index.php/topic,6530....l#msg61100