What is the primary purpose of retarders in a commercial vehicle?

The primary purpose of retarders in a commercial vehicle is to slow the vehicle while driving and reduce brake wear. Retarders are auxiliary braking systems that provide additional braking force, particularly in situations like descending hills where traditional brakes would be used extensively. By using retarders, drivers can maintain safer speeds without relying solely on their foot brakes, thereby minimizing the risk of brake overheating and wear. This helps in prolonging the life of the brake system and enhancing overall safety.

Retarders work by converting the vehicle's kinetic energy into heat, which is then dissipated, effectively slowing the vehicle down without the continuous application of the regular brake system. This not only aids in better control of the vehicle but also helps in maintaining consistent speeds in challenging driving conditions.