A brake light bulb replacement is needed when the brake light bulb goes out. All manufacturers have specifications on what type of brake light bulb to use. It is important to use the type of brake light bulb your vehicle's manufacturer recommends, because if the incorrect style or type of bulb is used it may cause damage to the wiring or lamp housing.
In performing a brake light bulb replacement you may need to remove the lamp assembly or even some trim panels to gain access to the defective brake light bulb.
While many manufacturer factory warranties and extended auto warranties do not cover the cost of a brake light bulb replacement, there are maintenance plans available that will cover the cost of a brake light bulb inspection.