brake judder?

[chaz]

was out on my fz6 (2005) today and a couple of times I got really bad front brake judder when braking quite hard at low speed.
brake disc would have been cold as I'd been parked up for over an hour. It's done it before but then it just stops doing it?
Not washed it for 150 miles, I use a wash & wax but rinse the discs well.

any thoughts?

[Grahamm]

Take a careful look at your brake disks and see if they're warped or otherwise out of true. If not, try checking (and, if necessary) cleaning your Brake Bobbins.

See http://www.hampshirebikers.co.uk/forum/showthread.php?tid=185 for details.