Manitoba Airbrake Practice Exam

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What is the role of the relay valve in an air brake system?

To serve as a brake actuator
To modulate the air pressure to the brake chambers
To reduce air pressure during braking
To increase pressure in emergency scenarios

The correct answer is: To modulate the air pressure to the brake chambers

The relay valve plays a crucial role in an air brake system by modulating air pressure to the brake chambers. This component is positioned between the brake pedal and the brake chambers on the vehicle's axles. When the brake pedal is applied, it senses the decrease in air pressure and responds by initiating a larger volume of air flow to the brake chambers, effectively increasing pressure and enhancing braking response. This modulation ensures that the brakes engage smoothly and with appropriate force, contributing to the overall effectiveness and safety of the braking system. The relay valve's ability to manage the pressure allows for quicker brake application and more evenly distributed braking across the vehicle, which is essential for maintaining control, especially under heavy loads or during emergency stops.