If a 1991 Nissan brake light inside the car comes on but turns off after 20 plus minutes do you need new brakes or brake light sensor?

The brake light, a red light shaped like a headlight on the dash means that one or more exterior lights are not working. It could be a taillight, brake light, side marker, license plate light, or third brake light. It stays on all the time if it's a side marker or any light besides the brake light. If it's the brake or third brake light it will come on only when you press the brake pedal.