How the retarder brake working?

A retarder brake, commonly used in heavy vehicles, functions by using hydraulic or electric systems to create resistance against the vehicle's wheels, thereby slowing it down without relying solely on traditional friction brakes. It operates by converting the vehicle's kinetic energy into heat, which is dissipated, helping to maintain speed control on downhill grades and reduce brake wear. This system enhances safety and efficiency, particularly in long-haul driving situations. Retarders can be especially effective in managing heavy loads while preserving the primary braking system for emergency situations.