In reply to gethin_allen:
> Seems to be a bit of a recent thing, my front brake started doing the same on the weekend, maybe the wear of all the winter crud has finally caught up with us.
> My plan when I finally bite the bullet and go into the freezing cold garage is to sand down the pads and the discs a bit with some aluminium oxide paper, give it a squirt with cleaner and hope that does the job.
If it's a front brake, check your headset/ bars are tight enough. The pressure from braking can exacerbate any play
Edited to acknowledge that you already discovered this! Took me a while first time it happened
Post edited at 20:28