minor annoyance....brakes

not sure anyone else has had any issues, but annoying as all get out. 8400 miles on my ST, and my wife drives it most of the time, and she drives like an old lady. Me, ONE spirited drive over Ortega behind a buddies CTSV wagon, and he now has a different opinion of smaller cars. Anyways thats another story. All of a sudden the front brakes ( primarily front right ) started squeeking like crazy, subtle dab of the brakes brings it on, whats subtle inside the car is like a screaming baby outside, reminicent of a badly LOUD squeeking belt. no pulsing of the car so I assume its not warped, tech removed wheel and said some moisture had gotten onto the brake pad ( looked like a tiny piece of rust ) to which I answered HUH?...what if I lived in a rainy state?...and seriously, isnt 8000 miles a tad pre-mature. pads arent worn, but hes replacing frt pads, both sides, and machining the culprit disc....but still, cars not abused, and 8000 miles?....Anyone?...