New Jersey Air Brakes Practice Test

Why do air brakes take more time to stop compared to hydraulic brakes?

1. Air brakes are less effective

2. Air brakes require more pressure

3. Air brakes take more time to flow through the lines than hydraulic fluid

4. Hydraulic fluid is more powerful

The correct answer is: Air brakes take more time to flow through the lines than hydraulic fluid

Air brakes take more time to stop compared to hydraulic brakes primarily due to the nature of the system and the medium they use for force transmission. In air brake systems, air must travel through a series of hoses and valves to reach the braking mechanism, which can introduce delays. Because air is compressible, it requires additional time for the air to build up the necessary pressure and flow through the system before it can effectively engage the brakes. In contrast, hydraulic brakes operate using incompressible hydraulic fluid, which can transmit force much more rapidly and efficiently. The fluid's ability to provide immediate pressure to the braking components allows for quicker response times when the brake pedal is applied. Therefore, the time it takes for air to flow and build pressure in an air brake system is significant in understanding the delays involved in its stopping power.