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servo brake

A type of wheel brake that uses the momentum of the aircraft to increase the friction applied by the brake. The brake drum is a hollow cylinder, turned by the wheel that rides over the brake shoes.

Brake linings, made of a material with a high coefficient of friction, are bonded to the surface of steel brake shoes and are pressed against the inside of the drum by the piston in a hydraulic brake cylinder. When the brakes are not being applied, a spring holds the shoes away from the drum. When the pilot depresses the brake pedal, hydraulic fluid forces the piston out and moves the shoe against the drum. The shoe is mounted in such a way that when it contacts the rotating drum, friction wedges it tightly against the drum. Movement of the aircraft increases the friction produced by the brake.

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