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It is the anti lock brake system. First, look at the ABS. It will come on for a bad wheel sensor or broken wire. This will also throw the trac light on. ABS is on because the computer senses the one tire is trying to stop or lock up. this releases the brake pressure. On the traction light(which should also throw the ABS light), one tire is spinning faster that another. This can happen on gravel, sand or snow/ice. When you turn the key on, do you have an ABS light on, then goes off? Same with a trac light. If you do, then you have a bad wheel sensor. Scan it and replace it.
Cou;d be a speed sensor/ABS. Cutting hard left or right is causing one wheel to move faster than the other. Slight variations will cause a traction light. Over time this will cause the ABS light to come on. I wouldn't worry about it right now. It would be hard to pinpoint the sensor that is going out. Just a note. When the ABS and Traction lights are on. All it does is revert your car back to the old system. Meaning that, your tires will lock up if you hit the brakes hard...
ABS LIGHT ON COULD BE A BAD WHEEL SENSOR CAUSING ABS UNIT LOCK UP THAT WHEEL OVERHEATING OR YOU COULD HAVE FAULT IN THE ABS UNIT.TAKE VECHICLE TO GARAGE OR DEALERSHIP.LET THEM SCAN THE ABS BRAKE SYSTEM TO SEE WHATS CAUSING ABS LIGHT TO COME ON.
Check your rear brakes and inside the rear Rotors. There are ABS scanners and if Autozone or Oreillys have that type of scanner, they will scan for free.
Because the Trac Control is on the Rear axle all of your problems are probably rearward. What usually happens is the Emergency brake material and the Rotor pads wear down and blind the sensors. Sometimes the Trac Control will destroy the brake linings. The Trac Control works by applying the rear brake to the fastest spinning wheel in an effort to match each rear wheels speed.
When the sensors have debris flying in front of them, they miscount and include the debris in figuring RPM. Someone needs to disassemble and inspect the back brakes.
The steering wheel position, wheel speed sensors, and ABS systems are all used to provide traction control. You likely have a failure of one or more systems. Scan the ABS system and it will provide codes to help the diagnosis. Wheel speed sensors fail often, and it is likely one or more of these is contributing to the problem.
I will bet money that it is the ABS/TRACS module. It is mounted under the master cylinder on the bottom of the ABS unit. These are very, very, very common failures. I have replaced hundreds of them in my career. To answer your other question, the TRACS system uses brakes. For example: in the snow, when the L or R wheel is spinning faster than the opposite, the TRACS will apply brake to the spinning wheel to slow it down to an equal speed. Hope this helps.
Def the wheel bearings/hub/speed sensor. I just bought a new wheel bearing comes with the hub and speed sensor as one. Runs about 80-100 dollars though but abs/traction light went off and stays off now.