Why should you use the permanent brake (retarder) of your motor vehicle?

Using the permanent brake, or retarder, in your motor vehicle is essential for several reasons according to German traffic regulations.

1. It operates without wear, meaning it can be used for extended periods without causing damage to your vehicle's components. This is particularly beneficial during long descents where continuous brake application could lead to overheating of the service brakes.

2. It can relieve the service braking device, which helps prevent overheating and extends the life of the traditional brakes. By utilizing the retarder, you reduce the amount of work your service brakes have to do.

3. While the retarder can significantly slow down the vehicle, it is important to understand that it may not always bring the vehicle to a complete standstill. Therefore, relying solely on it for stopping could be risky in certain situations.

Selecting the correct combination of answers is crucial because understanding the full capabilities and limitations of the retarder ensures safe driving practices and compliance with traffic laws, particularly those related to vehicle control in varying environments.