Hey guys

I've just dug the XT660R out after a few months of sitting unused. After cleaning and lubing the chain I headed off round the block to check the bike was OK, only to find that the front brakes are almost non-existent. Lever pressure at the bar seems normal but the bike just doesn't want to stop. The XT has always been rubbish on the brakes, and scares the hell out of me when I come back to it from a modern bike, but this is something else! It's never been capable of an emergency stop, but now it barely stops at all.

Maybe the pads are contaminated? Is there anything I should do to clean the disc, or the pads? Or rough them up? Or check caliper operation?