If its the same as a 313 do this;
remove wheel,push the pistons back in all the way (to make reassembly easy),remove two 19mm bolts on rear of caliper - these may be tight as they probably have Loctite on the threads.Lift off caliper and remove old pads.Install new pads,with a bit of copper grease on the METAL part.This will stop "brake squeal" If you need to change the disc just remove the Tor-x screw holding it on.Reverse the procedure for reassembly.
Tony
October 2007