Just noticed it today - whilst I'm sure it could be a few things, are warped discs most likely or is there another usual suspect?
There are a few threads about this already. Seems to be fairly common on the 950SM. Try a search?
I had the same problem on my 950SM and it definitely wasn't a glazed disc or my imagination. To check it, I put the bike on paddock stands and taped a wire pointer to the fork leg, almost touching the suspect disc, then spun the front wheel (helps if you remove the calipers). If the disc isn't running true, it'll be obvious as you watch the gap between pointer and disc. Mine had a definite warp (some people claimed that it's caused by muck on the bobbins, preventing the disc from floating, but cleaning them didn't work for me)
My disc had become so bad that I hated having to use the front brake and started using it less than before. I think it forced me to plan corners better and I'm convinced it actually improved my riding!
I bought a new disc which cost around 215 quid

Problem solved
