Originally Posted by Viney

Blimey, someone that can spell worse than me

The sv calipers have a bad tendancy for corrosion if not looked after properly. The front pisonts can sieze and damage the seals. So as advised pop the calipers off, get a can of brake cleaner and a toothbrush, remove the pads...if the pins are not siezed in, and thats another story, and give the pisons a real good scribbing with the brush a cleaner. Then VERY gently squeeze the brake lever(once) and watch the pistons. If one moves and the other doesnt, then hold the one thats moving and again gently squeeze the lever. This will hopefully move the stuck pison. Again, clean with the brush and cleaner, then push the pistons back into the cliper, re-fit/replace pads, remount claiper and pump the lever a few times until you get some feel back in the lever.

However, brakes are seriosu things. If you dont feel compitent with a spanner, then id advise getting help form someone that does, or take it to a garage.