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A power braking system consists of several distinct components, including the vacuum booster, master cylinder, brake fluid reservoir and lines, and calipers (or drums). Power brakes have been around in some form since the 1920s, and since the late 20th century all cars sold in North America have been equipped with power brakes.
Morrison-Knudsen spun-off the division in 1993; it became a publicly traded company in 1994. After Morrison-Knudsen's bankruptcy in 1996, MK Rail renamed itself "MotivePower Industries", doing business as "Boise Locomotive". The company merged with Westinghouse Air Brake Company (WABCO) in November 1999 [2] to form the Wabtec. [3]
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 .
The vacuum booster or vacuum servo is used in most modern hydraulic brake systems which contain four wheels, the vacuum booster is attached between the master cylinder and the brake pedal and multiplies the braking force applied by the driver.
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Booster set 836/2D had been designed by English Electric for use in Class 71 and this was retained in the rebuild, although weight considerations meant that the flywheel assembly, separate auxiliary generator and traction motor blowers were removed (the latter leading to the decision to downrate the traction motors).
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