Why is one brake light on while the other is off?

[VonZachary]

The reasons for one brake light being on while the other is off are as follows: 1. Aging wires, poor contact at connections, etc. Solution: Send to a 4S shop for inspection and repair. 2. Faulty brake light bulb. Solution: You can replace it with a new bulb for inspection. More information about brake lights is as follows: 1. When replacing brake light bulbs, both should be replaced simultaneously to prevent uneven filament burn-out, which could cause one light to be on while the other is off. 2. 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. This ensures that vehicles behind can easily detect when the vehicle in front is braking, even in low visibility conditions, helping to prevent rear-end collisions.