Air brake (road vehicle)

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Air brakes are used in trucks, buses, trailers and semi-trailers. George Westinghouse first developed air brakes for use in railway service. A safer air brake was patented by him on March 5, 1872. Originally constructed for use on trains, and still in common use as such, Westinghouse made many alterations to improve his invention, leading to various forms of the automatic brake, thus, its use was expanded to include road vehicles.

State of California, Copyright 2003, California Commercial Driver Handbook, Sec. 5

North American Standard Inspection Program, Commercial Vehicle Safety Alliance (12 December 2005). Tractor Protection Systems. Retrieved 7 September 2006 from: http://www.cvsa.org/resourcecenter/documents/2005_02_tractor_protection_systems_rev5.pdf#search=%22emergency%20brake%2C%20air%2C%20require%22

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