For the sake of your vehicle and your own safety, it's important that you take good care of your brakes. If your brakes start making an unusual sound, take your vehicle to an auto mechanic sooner rather than later.
This video from Angie's List discusses a few common brake sounds that are cause for concern. If you hear a high-pitched squeal that goes away when you're applying the brakes, it's time to get your brakes checked. If you ignore that warning, you may hear a nasty grinding sound, which means your brake pads have worn all the way through. If your vehicle is making any unusual sounds at all, have the San Jose auto mechanics at Precision Motorworks take a look.