There are a few reasons your brakes may make noise when you come to a complete stop. One possibility is that your brake pads have worn down and need to be replaced. If your brake pads are too thin, they can start to squeal or grind when they come into contact with your brake rotors. Another possibility is that there is debris caught in between your brake pads and rotors, causing them to make noise when you press the brakes. If you hear a high-pitched squealing noise, it's likely due to low brake pad thickness or debris caught in the brakes. A grinding noise usually indicates more serious wear and tear on the brake system and should be inspected by a mechanic as soon as possible.