I have noticed over the last few days that when starting my LC for the first time, the first few times I apply the brakes they make a loud squeaking sound. This goes away after the first few applications, then returns again the next time I start the vehicle. The brake pads are fairly new (done about 10K miles ago) and I don't hear that metalic clicking noise anyway - more of a loud squeak or two when first applied and that's it. Any ideas what it coud be (and more importantly, is it something to be concerned about?)