For all things check engine light
If your brake light goes on when your parking brake is off, you need to check your brake fluid levels. A brake fluid leak manifests itself by sight (a light amber color) and a smell that is distinctive. Rotor surface issues will cause your brake pedal or wheel to vibrate. Brakes that need repair may squeal until you come to a full stop or when you release the brake pedal. When that happens, it means that the brake wear indicators may be scraping against the rotors.