What is the best method to check brake lights on a vehicle?

To ensure the brake lights are functioning properly, having a co-worker check that the lights illuminate when the brake pedal is pressed is the most effective method. This approach allows for direct observation of the brake lights in action, confirming that they activate appropriately when the brakes are applied.

By using a second person, you can accurately assess if both the left and right brake lights are operational without moving around the vehicle, which can be cumbersome and time-consuming. This method gives assurance that the lights are visibly functioning as designed, which is crucial for safety on the road.

Other methods, while they may provide some information, are not as reliable. Checking the reflection could lead to misjudgment, especially if visibility is obstructed. Removing the lens cover to inspect the filament is not a practical or efficient solution, as it doesn't confirm operational status under normal driving conditions. Installing a new lamp presumes that the previous lamp was faulty without first confirming it was necessary, creating unnecessary work and potential disruptions. Thus, verification through direct observation by another person is the most reliable method to check brake light functionality.