What is the purpose of retarders is to?

Retarders are devices that are used in automotive braking systems to help slow down or stop a vehicle. The purpose of retarders is to assist the primary braking system, usually hydraulic brakes, in stopping a vehicle safely and efficiently. They work by providing additional resistance to the movement of the vehicle's wheels, helping to dissipate the energy generated by the moving vehicle.

Retarders are commonly used in larger, commercial vehicles such as trucks and buses, where the weight and size of the vehicle can make braking more challenging. By using retarders in conjunction with hydraulic brakes, drivers can have more control over the speed and stopping distance of their vehicle, especially when going down steep grades or in heavy traffic situations.

Overall, the purpose of retarders is to enhance the braking performance of a vehicle, improve driver control, and increase safety on the road.