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Q:will this sensor tell me when my rear brakes are low or need replacing, on my 2003 BMW 745i 4.4?
A:With reference to your inqiry on the BWD/Intermotor ABS Sensor - part# ABS569, an Antilock Brake System sensor is a device that monitors the rotational velocity of a wheel on a car or truck. The sensor rides on top of the notched ring attached to the brake rotor. A computer monitors changes in the velocity of all 4 wheels. If it detects that one or more wheels are rotating at a different speed from the others, it will activate either the antilock braking system, which prevents the wheels from locking up - hence skidding. ABS sensor readings are also used in cars equipped with traction and electronic stability control (ESC) systems. For traction control, they detect wheel spin, and reduce engine power to compensate. On cars with ESC, the computer can apply braking force to one or more wheels as needed to maintain tire grip in emergency handling situations. For any further assistance, please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.