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Traction control prevents absolute wheel lock while braking. This allows the vehicle to maintain stability during motion, in unfavorable conditions, such as gravel, ice, wet asphalt, snow, where adhesion reduces the braking distance. Apart from that, the vehicle equipped with ABS remains manageable even when the brake pedal is squeezed at the maximum. ABS is a mechanism with sensors that monitor rotation speed of the wheels and vehicle speed.

Once the sensors detect that one or more wheels are not rotating, and the car continues to move - this means the wheels were locked. At the same time the brake system receives a signal meaning braking pressure decrease, and the wheels are immediately unlocked. The whole ABS work is reduced to the braking-analysis-unlocking of wheels. The more often this cycle is repeated, the more efficient is the braking process.

ABS sensors are mounted into the two front wheels and one more sensor located in the area of the rear axle gear. Front wheel hubs of cars, equipped with ABS, have a special design, which is not compatible with conventional cars, not equipped with ABS. The same goes for the rear axle gear boxes. The sensor consists of several parts - rotor and stator. The rotor is located on the rotating part and looks like a gear. The stator - is an electromagnetic coil with a magnet that, in fact, is called sensor. When you rotate the wheel, the sensor generates electrical impulses. The number of pulses per time unit reflects the speed of rotation.

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What you need to know about ABS sensor replacement: lifetime limits, common defects and their signs, tips and recommendations

Manufacturers do not specify a certain lifetime limit for the wheel rotational speed sensor. The main causes of its breakdown are breakage of connection wires or inner winding, connector corrosion, mechanical damages.

A continuously active indicator of ABS defect points at breakdown of the wheel rotational speed sensor. Moreover, the system doesn’t work or turns off randomly. If after self-diagnostics the ABS system finds fault but continues working, then defect cause can be the wheel rotational speed sensor or the lateral acceleration sensor which are used in the stability control system.

Precise estimation of ABS sensor condition can be given only by service station specialists after performing computerized diagnostics. Moreover, diagnostics may presuppose measuring of resistance and voltage in the system. Also, value of the gap between the sensor and the toothed rotor is measured and then compared with the value set by the manufacturer.

In order to replace the component located on the front wheel you need to unscrew the ABS sensor fastening bolt and remove it from the hole in the front suspension steering knuckle. Then you should extract the sensor wiring harness from the front suspension strut mounting bracket, screw out the mounting bracket, take wires aside and disconnect the wire harness connector. After that remove the broken down component and install a new one. For rear wheel sensor replacement you need to demount rear door sill cover and take the wire harness connector out of the hole in the car body panel. Then screw off the fasteners of the sensor and wires and remove them, as well as the sealing plug. Replace the component and perform assembling in the reverse order.