Air Brakes Basic Question and Answer

Question 1

What is the primary function of an air brake system?

Accepted Answer

To stop or slow down the vehicle

Answer

The primary function of an air brake system is to effectively stop or slow down a heavy vehicle by converting kinetic energy into heat through friction. It uses compressed air to actuate brake components at each wheel, providing the necessary force for reliable deceleration and stopping. This system is crucial for the safe operation of large commercial vehicles.

Question 2

What component stores compressed air for braking?

Accepted Answer

Air tank

Answer

The air tank, also known as a reservoir, is a crucial component in an air brake system responsible for storing compressed air. This stored air is then used to actuate the brakes when the driver applies the brake pedal, ensuring a constant and sufficient supply of air pressure for effective braking. Without air tanks, the system would not have the necessary pressure reserve.

Question 3

Which pedal does a driver press to apply the air brakes?

Accepted Answer

Brake pedal

Answer

The brake pedal is the primary control that a driver presses to apply the service brakes in an air brake system. When pressed, it signals the system to release compressed air to the brake chambers at each wheel, initiating the braking action. This direct interface allows the driver to control the vehicle's deceleration and stopping power.

Question 4

What happens if the air pressure in the system drops too low?

Accepted Answer

Brakes will automatically apply

Answer

Air brake systems are designed with a critical safety feature: if the air pressure drops too low (typically below 20-45 psi), the spring brakes will automatically engage. This mechanism ensures that the vehicle can still be brought to a stop, preventing runaway situations even in the event of a major air leak or system failure, thereby enhancing safety.

Question 5

What is the purpose of a governor in an air brake system?

Accepted Answer

It controls the air compressor

Answer

The governor is a vital component in an air brake system that controls the air compressor. Its purpose is to regulate the air pressure within the system by dictating when the compressor starts pumping air into the tanks (cut-in pressure) and when it stops (cut-out pressure). This ensures the air pressure remains within the optimal and safe operating range.

Air Brake Practice Test Practice Test

Air Brake Practice Test Practice Test

Air Brakes Basic Question and Answer