Brakes

Every time when braking, When I first push down the brake pedal lightly you at first feel a little twinge I guess you would call it, but then the feeling disappears and the brakes work alright. I may hear a little sound when the pedal is pushed I had the brakes checked and they said the brakes are good. I tend to notice it more after a lot of driving or if the weather is really humid. Any Ideas!!! I have a 2004 Hyundai Elantra GL