Why does one rear brake light not light up but works when tapped?

[StKira]

The reason why one rear brake light does not light up but works when tapped may be due to poor internal contact of the brake switch. It is necessary to check the wiring and connector of the abnormal brake switch. Brake lights are generally installed at the rear of the vehicle, with the main body color being red to enhance the penetration of the light source, so that vehicles behind can easily detect the braking of the vehicle in front even in low visibility conditions, thereby preventing rear-end collisions. Information about brake lights is as follows: 1. In simple vehicle models, power passes through a fuse to the brake switch. When the brake pedal is pressed for braking, the switch connects, and electricity is sent to two brake lights and one high-mounted brake light, forming a circuit through the negative line connected to the vehicle body. 2. Depending on the materials used to make the brake lights, they can be roughly divided into gas brake lights and LED brake lights.