New Jersey Air Brakes Practice Test

Which gauge shows the pressure in the air tanks?

1. Temperature gauge

2. Supply pressure gauge

3. Fuel gauge

4. Voltage gauge

The correct answer is: Supply pressure gauge

The supply pressure gauge is specifically designed to show the pressure in the air tanks of a vehicle equipped with air brakes. This gauge indicates the level of air pressure that is available for activating the brakes, which is crucial for ensuring safe and efficient operation of air brake systems. Understanding the function of this gauge is vital for drivers, as adequate air pressure is necessary for the proper functioning of air brakes. If the pressure is too low, it can lead to insufficient braking power, which is dangerous. Thus, monitoring the supply pressure gauge allows drivers to respond accordingly, ensuring that they maintain the necessary pressure in the air tanks throughout their journey. This particular gauge directly correlates with the air brake system, while the other gauges listed serve different functions. For instance, the temperature gauge measures engine temperature, the fuel gauge indicates the level of fuel in the tank, and the voltage gauge reflects the electrical system's voltage. None of these gauges provide information about the air pressure in the tanks, making the supply pressure gauge the essential tool for this specific measurement.