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Antilock Brake System (ABS)

The antilock brake system has become an important safety feature that is standard on most of today’s vehicles. This system works by the computer receiving input signals from individual wheel sensors indicating the speed of each wheel. It then compares the speed of each wheel with that of the others. If the comparison indicates wheel lockup is occurring, the computer sends output commands to various valves and other actuators to raise or lower hydraulic pressure to the individual wheels to prevent a skid. This action is repeated thousands of times per second to produce maximum stopping ability under any driving condition. All of this activity goes unnoticed by the driver unless a component fault is detected by the computer and lights the Brake or ABS warning lamp on the instrument panel.