New Jersey Air Brakes Practice Test

What key factor should you monitor to prevent brake failure on steep descents?

1. Engine temperature

2. Brake drum temperature

3. Air pressure levels

4. Vehicle weight

The correct answer is: Brake drum temperature

Monitoring brake drum temperature is critical for preventing brake failure on steep descents. When descending steep hills, brakes are subjected to continuous and intense friction, which generates significant heat. If the brake drums overheat, they can lead to brake fade, where the brakes become less effective or even fail altogether. By keeping an eye on the brake drum temperature, you can ensure that they remain within safe operational limits. If the temperature rises too high, you have the opportunity to take preventive measures, such as pulling over to allow the brakes to cool. This proactive approach is vital to maintaining control of the vehicle and ensuring safety while navigating downhill routes. While air pressure levels and vehicle weight are also important factors in the overall braking system performance, they do not specifically address the immediate risk of brake overheating during steep descents. Engine temperature, while relevant to the vehicle's overall operation, does not directly correlate with brake performance in the context of downhill driving.