A lot of the sounds you guys are describing are, Imo, because of moisture on pads/rotors and just the brand of pads you have. Diff pads make diff sounds and are prone to diff behavior...but also something could have popped loose, like anti-rattle clips in there. Since I don't know much about brakes, I suggest taking it in to a mechanic just to see if it's normal sound or not.
In my case,
I took it to a shop, and talked to the mech looking it over. I knew the rotors and pads were fine, and he confirmed this. The caliper slides were fine also.
One thing he did determine was that whatever the problem is, it is on the right side. While my exp was raised, I could turn the front wheels, and the left one turned quietly but the right one turned with a little noise. I mentioned the front wheel bearings but the mech said they were ok. I wonder about that a little.
Now I think in my case it must be something with the steering, and applying the brake aggravates it. Maybe the tie rod ends need a little grease, or the ball joints or steering knuckle. Maybe something just needs to be torqued down on that side. I know it is something to do with where the steering setup connects with the right side.