New Jersey Air Brakes Practice Test

How should you safely reduce speed when going downhill?

1. Shift to neutral and coast

2. Alternately apply the accelerator and brake

3. Apply service brakes to maintain control

4. Use engine braking exclusively

The correct answer is: Apply service brakes to maintain control

Applying service brakes to maintain control when going downhill is a critical safety measure. This technique enables the driver to regulate the vehicle's speed effectively while ensuring it remains stable. When going downhill, gravity can significantly increase the vehicle's speed, leading to potential loss of control if not managed properly. Utilizing the service brakes allows for continuous adjustments to the speed, helping to prevent overheating and ensure effective braking performance throughout the descent. This method is particularly important in maintaining a safe speed, which is especially imperative when navigating steep or winding roads. The combination of service brakes and, when necessary, engine braking provides a balanced approach to maintaining control while descending. In contrast, coasting in neutral can lead to an unsafe situation as power steering and braking may be compromised. Alternately applying the accelerator and brake can create erratic movements and reduces the driver's control over the vehicle. Relying solely on engine braking, while a useful technique, may not be sufficient in all circumstances and should be complemented with service braking to ensure safety.