Hi,
It's probably the caliper sticking.
The first thing to do would be to disconnect the caliper and free up the moving pins with some copper grease, then add a spot of copper grease on the pads where they touch the caliper.. Also check the pads for wear and change if nessasary. If this doesn't work then there are other things to check.Good luck
Steve Sherwood (smws@gmail.com), December 2008