Air brake boosters, also known as air brake amplifiers, are used in heavy-duty vehicles to amplify the braking force applied by the driver. This helps to reduce the amount of effort needed to apply the brakes, making it easier for the driver to stop the vehicle. Air brake boosters are particularly useful for vehicles that carry heavy loads, as they can help to reduce the amount of force that the driver needs to apply to the brake pedal in order to bring the vehicle to a stop. They are also useful for vehicles that operate in extreme temperatures, as the air pressure system is less prone to failure than a hydraulic system.