Daz, I changed my pads without removing the wheel or caliper. the pads are held in place with a pin and lock as the SM states. If you can raise the bike and remove the lock( remember how it goes to put it back... PITA) and drift out the pin from left to right and remove the pads. At this point blow/ clean out all debris from the caliper. slightly open the bleeder and push the pistons back with your fingers and close the bleeder,replace the pads, pin, and lock. Pump the pedal slowly and check the resevoir.Also while your in there lubricate sparingly the contact pointsof the pads without getting any on the pad surface so they work freely.