How do you shut off the service brake system light and alarm on a 2009 GMC 5500 4 wheel drive?

To turn off the service brake system light and alarm on a 2009 GMC 5500, first check for any issues with the brake system, such as low fluid levels or worn brake components, as these can trigger the warning. If the problem has been resolved, disconnect the vehicle's battery for about 15 minutes to reset the system. Alternatively, using an OBD-II scanner to clear any diagnostic trouble codes (DTCs) can also turn off the light. If the warning persists, consult a professional mechanic for a thorough inspection.