My 08 X5 now has 3000KM on it (

too bad I don't drive it a lot). But recently I was so pissed off by the brake squeak. It happens when I drive slowly or at slow acceleration from a stop sign and I could'nt tell it's from the front or rear (or both). But it disappears when I hit the brake. This annoying squeak gets worse when it's wet or snowing and makes my X5 sounds like a ice cream truck.
I got an appointment with my dealer but I will have to wait two weeks. Does anyone here experienced the similar problem or any suggetion about the cause? Thanks.