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Each wheel has magnetic or optical sending units that tell the computer the speed that each wheel is turning at. When you apply the brakes the computer reads the relationship of speed that each wheel slows down at. If even one wheel is reading a different speed of deceleration than the others, there is obviously a problem with that wheels brake system. it could be worn pads, worn rotors. stuck caliper, or the speed sensing unit could be defective, any of these conditions will trigger the computer to send a malfunction signal to the dashboard lighting up the ABS light. A simple test can determine the fault done by a code reader. or you can save money by visually inspecting the brake components.
Is the light on when you start the engine? or does it come on when you apply the brakes. If always on the computer needs to be reset then see when the light comes back on. If it comes right back on, without applying the brakes, probably a bad speed sensor or worse, a defective computer.
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ABS Light - Volkswagen Polo 2002 1.2?
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ABS means Anti-lock Brake System. If the light is staying on, you probably need to have your brakes checked.
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