Which system helps keep the brake temperature within safe limits during long downhill drives?

The exhaust brake system is crucial for maintaining safe brake temperatures during long downhill drives. This system works by using the engine's exhaust to create back pressure, which slows down the vehicle without relying solely on the traditional braking system. By engaging the exhaust brake, the driver can reduce the need for constant brake application, which helps prevent brake overheating and maintains optimal braking performance.

In scenarios where heavy braking is continuously applied, such as during long descents, conventional brakes can heat up significantly and may lead to brake fade, compromising safety. The exhaust brake system provides an additional layer of control, allowing for more effective speed management and reducing the risk of brake failure due to overheating. This not only enhances vehicle safety but also extends the lifespan of the braking components, making it an essential feature for heavy vehicles like tractor-trailers that often face demanding driving conditions.