The document summarizes the working of an anti-lock braking system (ABS). It explains that ABS prevents wheel lockup during hard braking, allowing the driver to steer and reducing stopping distances. It works by automatically reducing brake pressure if a wheel slows too quickly compared to others. The history and components of ABS are also outlined, including speed sensors, valves, pump and controller. Advantages include maintaining control on slippery surfaces and higher resale values, while disadvantages are the higher cost and delicate nature of the system.

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