Air Brake Practice Test

What is the function of the engine retarders?

1. To prevent slides and skids

2. Applies extra braking power to non-drive axles

3. Help slow down the vehicle and reduce wear on the brakes

4. Provides emergency brakes

The correct answer is: Help slow down the vehicle and reduce wear on the brakes

The function of engine retarders is to help slow down the vehicle and reduce wear on the brakes. Engine retarders work by using the engine's compression or exhaust to create resistance that helps in decelerating the vehicle, especially during downhill driving scenarios. This use of engine power contributes to maintaining a lower speed without solely relying on the traditional braking system. As a result, they alleviate some of the heat and wear that would normally occur with frequent application of the standard brakes. This can enhance the lifespan of the brake components and improve overall vehicle safety by providing an additional means of controlling speed. By focusing on deceleration through the engine, retarders offer a more efficient way to manage vehicle speed, particularly in challenging driving conditions, thereby integrating seamlessly into the overall braking system without introducing the risk associated with emergency braking measures.