Which valves are used to control the air flow in the braking system?

The correct choice highlights the importance of both the control valve and the brake application valve in managing air flow in the braking system.

The control valve, also known as the relay valve, regulates air pressure for the braking system based on the driver's input from the brake pedal. It ensures that the system has the right amount of air pressure to activate the brakes efficiently.

The brake application valve serves a vital role as well by controlling the application of air pressure to the brake chambers when the driver presses the brake pedal. It directly influences how quickly and effectively the brakes respond to the driver's commands by modulating the air pressure supplied to the braking system components.

Together, these valves work to create a responsive and effective braking system, ensuring that the vehicle can come to a stop safely and efficiently when required.