What is the name of the valve that controls the flow of air in the brake system?

The valve that controls the flow of air in the brake system is known as the brake valve or treadle valve. This component plays a crucial role in a vehicle's air brake system by regulating the air pressure sent to the brakes when the driver presses the brake pedal. When the driver applies pressure to the pedal, the treadle valve opens to allow compressed air to flow to the brake chambers, engaging the brakes and slowing down or stopping the vehicle.

In addition to its primary function of controlling air flow, the brake valve often incorporates features that enhance safety and efficiency. For instance, it might include a spring return mechanism that ensures the valve returns to its closed position once the pedal is released, thus preventing unintended brake engagement.

Understanding the function of the brake valve is essential for CDL drivers, as it directly affects vehicle control and braking performance. Proper knowledge of this component helps ensure safe driving practices, particularly in heavy vehicles that rely on robust air brake systems.