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Check the brake light switch.
When parked.
You should always set the parking brake no matter where you are parked.
The hand brake is on.
keep hand brake
The P stands for Park. The Hand Brake is the brake you use while parked, hence why there is a P on it.
The switch is out of adjustment.
reverse and set the parking brake.
The transmission is not in park and/or the parking brake is not applied.
If none of the brake lights are working i would suspect the brake switch at the brake pedal.
Either the parking brake / transmission gave out or sombody else hit it for you.
To avoid the car from rolling forward.