What is the function of the control valve in air brakes?

The control valve in air brakes plays a crucial role in managing how air pressure is distributed to the braking system in response to the driver's actions. When the driver applies pressure to the brake pedal, the control valve interprets this input and regulates the amount of compressed air that is sent to the brake chambers. This allows for precise control over the braking force applied to each wheel, ensuring that the vehicle slows down or stops smoothly and safely. The effective functioning of the control valve is vital for maintaining balance and stability in the braking system, which is important for both safety and performance.

Other options present functions that do not accurately describe the role of the control valve. Amplifying pressure is more characteristic of a different component in the system, such as a booster. Monitoring tire pressure is unrelated to the braking system itself and instead pertains to vehicle safety in terms of tire maintenance. Lastly, adjusting the brake pedal height is a mechanical adjustment that does not involve the control valve, which focuses on the distribution of air rather than physical alterations to the brake pedal.