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In the US it is commonly called a brake booster. A vacuum servo, also known as a power booster or power brake unit, uses a vacuum, usually supplied by the engine, to multiply the driver's pedal effort and apply that effort to the master cylinder .
Invented in 1897, the Duck brake or Duck roller brake used a rod operated by a lever on the handlebar to pull twin friction rollers (usually made of wood or rubber) against the front tyre. [6] Mounted on axles secured by friction washers and set at an angle to conform to the shape of the tyre, the rollers were forced against their friction ...