Newer vehicles are equipped with a brake warning lamp on the instrument panel. This lamp:
Should come on when the parking brake is released.
Comes on to indicate that the brake system is defective.
Will never come on.
Comes on to indicate that the brake lights are operational.
The brake warning lamp should go out when the parking brake is released. If it illuminates when the foot brake pedal is pressed, the brake system is defective and the vehicle should not be driven.