This is the control unit that creates hydraulic pressure.
What it is
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A hand-operated master cylinder
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Usually connected to a brake lever (common on:
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Light aircraft
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Ultralights
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Gyroplanes
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Experimental aircraft)
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What it does
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When the pilot pulls the lever, a piston inside the master cylinder:
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Pressurizes brake fluid
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Sends that pressure into the hydraulic line
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Releasing the lever releases pressure → brakes disengage