From my head on fuel injector service
It is really just another component of a good car maintenance program. If you think about it, your brakes are meant to wear down as they stop your car and would not be working properly otherwise. Brake repair returns your braking system to full functionality, just as a tune up brings your engine back up to snuff. Your brakes have a way of letting you know when brake repair is necessary. If your brake light illuminates when your parking brake is disengaged, have your brake fluid level checked.