Thanks for all your help. I have a slight problem though. When I removed the rear brake caliper, the sliding pin rubber boot popped out from the caliper mounting bracket. If you imagine looking at the boot with the end that fits into the mounting bracket to the left, there is a very narrow ring, then a fatter one, then a larger one. With the very narrow bit inserted, it just falls out, so I'm assuming that the next 'fatter' bit should fit into the bracket also? If so, is there a 'technique' to do it? - Cheers