What is the primary reason for loss of control while going downhill?

Answer: B — Brake failure and improper control techniques

The primary reason for loss of control while going downhill is brake failure and improper control techniques. When driving downhill, the vehicle experiences increased momentum which can lead to higher speeds if not managed properly. Effective control techniques, such as using lower gears to help maintain speed, are essential. If the brakes are not functioning correctly or if the driver does not apply the brakes effectively, the vehicle can gain too much speed and become difficult to control. This situation is particularly dangerous because it can lead to accidents, especially if combined with other factors like road conditions or traffic. Proper training in downhill driving techniques, such as engine braking and controlling vehicle speed, is crucial to prevent these scenarios. Understanding the mechanics of the truck's braking system is equally important to ensure that it can handle steep descents safely.