Michigan CDL - Air Brakes Practice Exam

The role of the brake light relay valve is to ensure that the brake lights activate when the brakes are applied. This is a critical safety feature, as it communicates to other drivers that the vehicle is slowing down or stopping, thereby helping to prevent collisions. The activation of the brake lights occurs when pressure is applied to the brake system, signaling to other road users that your vehicle is decelerating.

The functionality of the brake light relay valve is integral to maintaining effective communication on the road, enhancing overall safety. It works in conjunction with the braking system to ensure that visibility is maintained around the vehicle, particularly in situations where sudden stops may occur. Proper operation of the brake lights reinforces safe driving practices, allows following vehicles to react appropriately, and is an important aspect of road safety regulations concerning commercial driving.