Hydraulic System(s) power the brakes?

• A. System 1
• B. System 2
• C. Systems 1 and 2
• D. Neither system powers the brakes

Answer: (C)

Brakes are typically powered by hydraulic pressure, and in aircraft with two independent hydraulic systems, both System 1 and System 2 feed the wheel brake assemblies. When you press the brake pedal, a metering or control valve directs fluid from the active hydraulic source to the brake calipers, creating the clamping force that stops rotation. Having both systems available provides essential redundancy: if one system loses pressure, the other can still operate the brakes, maintaining braking capability (though performance or features may be affected). Anti-skid systems are integrated with these hydraulic circuits to modulate pressure and prevent wheel lock during braking. So the brakes are powered by both hydraulic systems, not just one or neither.