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ABS (anti-lock brake system) is a safety system that prevents your car from skidding or sliding when you apply the brakes. There are two main components: the ABS speed sensors and the ABS control module. When the brake is applied, the ABS control module reads the speed data from the speed sensor and sends the correct pressure to each wheel to prevent any sliding/skidding (wheels locking up).
If the ABS module or one of the sensors goes bad, the ABS warning light will turn on and it will disable the ABS. You will still be able to slow down and stop your car, but it will not prevent the wheel from sliding when you apply the brakes (especially critical on wet or slippery surfaces).
All services associated with proper function of your brakes are important. In addition to safety issues, ignoring small repairs can quickly lead to more serious (and more expensive) problems.