What is the function of retarders in large vehicles?

Retarders serve a critical function in large vehicles by aiding the braking system, thus reducing the workload on standard brake components. When driving large vehicles, such as buses or trucks, the sheer mass of the vehicle can place immense stress on the brakes during deceleration. Retarders are secondary braking systems designed to provide additional slowing power without relying solely on hydraulic or air brakes.

By utilizing mechanisms such as engine braking or electric water resistance, retarders help to dissipate the vehicle’s kinetic energy. This allows for smoother and more controlled deceleration, especially during long downhill descents or in situations requiring frequent stopping. As a result, they extend the life of the primary braking system, reduce the risk of brake fade (which can occur when brakes overheat), and enhance overall vehicle safety. Thus, recognizing the function of retarders as an aid to braking underscores their importance in managing vehicle speed and ensuring safety on the road.