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What is required to operate the brakes in aircraft brakes that require a large volume of fluid?
Power brake control valves
Hydraulic fluid
Brake pedals
Electrical switches
The correct answer is: Power brake control valves
In aircraft brakes that require a large volume of fluid, power brake control valves are essential for operating the brakes effectively. These valves control the flow and pressure of hydraulic fluid to actuate the brakes, allowing for precise and reliable braking action. Hydraulic fluid alone is not sufficient to operate the brakes without the control provided by the power brake control valves. Brake pedals are used by the pilot or aircraft operator to activate the brakes, but they rely on the hydraulic system and control valves to actually engage the brakes. Electrical switches are not directly involved in operating the brakes in this context; instead, they might be used in other parts of the aircraft's systems.