The purpose of retarders is to...

• A. The purpose of retarders is to slow the vehicle while driving and reduce brake wear.
• B. The purpose of retarders is to increase accelerator response.
• C. The purpose of retarders is to improve engine performance.
• D. The purpose of retarders is to protect tires from wear.

Answer: (A)

Retarders slow the vehicle without relying on the main service brakes, helping control speed on downgrades and reducing brake wear. By providing braking force independently, they keep the service brakes cooler and last longer, which is especially useful on long descents. They aren’t intended to increase accelerator response or to improve engine performance; their role is braking, not power. They also aren’t primarily about protecting tires; tire wear is affected by road grip and tire condition, while retarders mainly reduce wear and heat in the braking system.