There are a variety of safety features that are designed on vehicles today, one being the brake lamp. So many times people in vehicle accidents claim they didn't see the person in front of them putting on their brakes.
The brake lamp was designed as an additional safety feature on cars. The brake lamp is the lighted bar that's installed in the lower back window of vehicles. As the driver steps on the brake, the lighted bar will also light up, signaling that the driver is stopping.
The main reason the brake lamp was designed and installed in the back window of cars is because it's at an equal level as a person's eyes would be if they're driving in the car behind yours. If the driver behind you doesn't see your brake lights, they will surely see your brake lamp light up.
The maintenance on your car's brake lamp is very simple. Just the same way that you change any other bulb on your vehicle, this is the same for your brake lamp. Just remove the bulb and replace it with an appropriate new bulb. Your local auto store will carry the correct size bulbs needed according to your style of car.