A few notes here.
Use blue loctite on the caliper bolts and tighten to specs.
Change the pads one at a time, remove one, push the piston back in it's bore, then install pad, repeat on other piston of caliper. Do not remove both pads at the same time.
You should be thoroughly flushing the brake fluid on an annual basis, if not flush it at the time of your brake job, and then start flushing annually.