It depends on your vehicle! For trucks it can be as simple as two screws. The same goes for some hatchback cars. For sedans and most other cars, the 3rd brake light can be accessed from inside the boot. Have you ever done this yourself?

LED brake lights are highly reliable solid state devices. On cars, they are mounted in such a way that the connections are not exposed to the weather. The brake light bulb size depends on the make of the car and the wattage of the bulb itself. Brake light bulbs can be xenon, halogen, LED or conventional light bulbs. The price of each bulb is different depending on durability and brand.