You don't need to do anything to keep them happy. Those are hydraulic disk brakes, so no cables to tighten. Your LBS can replace the hydraulic fluid if necessary but they should run a long time without needing that. The brake pads can be replaced when worn, and the gaps around the disk can be adjusted, but you won't need to do anything unless the brakes cease to work properly or the pads start rubbing the disk. Just be kind to the disks so they don't get bashed or warped.