Normally there are 4 bolts that hold the caliper, 2 hold the brake bracket to the hub, then the caliper itself has two bolts that screw into the bracket, they are on slider pins, you can remove one and the caliper can hinge off, so that you can remove / change pads.
You only need to remove the bracket if you want to replace the disc.
Hope it helps, most brakes are the same in design, if I remember correctly caliper bolts are 13mm.