What is a retarder cdl?

A retarder CDL, also known as a retarder control device license, is a specialized endorsement that some commercial drivers may need in order to operate vehicles equipped with a hydraulic retarder system.

A hydraulic retarder is a braking system that uses hydraulic pressure to slow down a vehicle by applying resistance to the driveshaft. This can be particularly useful for controlling speed when driving downhill or in situations where heavy braking is required, as it helps prevent wear and tear on the vehicle's traditional braking system.

To obtain a retarder CDL endorsement, drivers typically need to pass a written exam that covers the operation and maintenance of hydraulic retarder systems, as well as demonstrate their ability to safely operate vehicles equipped with this technology. The requirements for obtaining a retarder CDL endorsement may vary by state, so it's important to check with your local Department of Motor Vehicles for specific information on how to obtain this endorsement.