What is the purpose for brake retarders?

Brake retarders, commonly used in heavy vehicles, serve to reduce speed without the need to apply the traditional braking system, thus minimizing brake wear and overheating. They work by using engine compression or hydraulic systems to create resistance, helping to maintain a safe speed, especially on downhill slopes. This enhances overall vehicle control and safety while improving fuel efficiency by allowing the driver to rely less on the service brakes. Additionally, they provide a smoother deceleration experience for passengers.