New Jersey Air Brakes Practice Test

What type of braking system is primarily used in large vehicles?

1. Hydraulic system

2. Air braking system

3. Electric braking system

4. Mechanical braking system

The correct answer is: Air braking system

The air braking system is primarily used in large vehicles due to its effectiveness and reliability in managing the significant weight and momentum of these vehicles. Air brakes function by using compressed air to apply force to the brake mechanisms, which allows for more controlled braking and a higher stopping power compared to other systems. One of the major advantages of air brakes is their ability to fail safely; if the air supply is lost due to a leak or malfunction, the brakes engage automatically, preventing the vehicle from rolling. This is particularly critical for large vehicles that have substantial stopping distances. The system also allows for the use of larger brake pads and rotors, which contribute to better heat dissipation and overall efficiency when braking. In contrast, hydraulic systems, typically used in smaller vehicles, rely on brake fluid to transmit force, and they may not provide the same level of performance when applied to larger vehicles. Electric braking systems are more commonly found in hybrid and electric vehicles, but they are less prevalent in large trucks and buses. Mechanical braking systems can be effective but do not offer the same level of force control as air brakes, particularly under heavy loads. Thus, while other systems have their uses, the air braking system remains the standard for large vehicles due to its unique benefits.