When should you turn off the retarder?

The retarder is designed to help reduce the speed of a vehicle without the need for brake application, especially in situations where maintaining control is critical. Turning off the retarder when your drive wheels have poor traction is crucial because using the retarder can further decrease wheel traction, potentially leading to a loss of control. If the wheels are not gripping the road adequately, engaging the retarder could cause the vehicle to skid or slide, particularly in slippery conditions.

This caution is essential for safety. Under normal weather conditions, using the retarder can be beneficial, and while driving downhill it may actually be helpful in controlling speed. Additionally, turning at intersections typically requires precise maneuvering and doesn't inherently require turning off the retarder unless traction is compromised at that moment. Thus, recognizing when traction is limited and responding appropriately by turning off the retarder enhances overall vehicle handling and safety.