brake maintenance advice needed

[misterprofessionality]

So, I'm pretty religious about bleeding my brakes and cleaning up and so on, but I can't help but think after 46k miles that the calipers and master cylinder might need some kind of maintenance. To be honest, they brakes do feel kind of "old" these days. The smoothness that they once exhibited in the front just isn't there anymore. My EBC HH sintered pads have a long way to go, so they're fine.

So what should I do to refresh my calipers and master cylinder? should i do anything at all? is any maintenance needed to keep those parts running in top form?