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I have 2006 Pontiac Torrent AWD with front disc and rear drum brakes. I need help with my ABS & traction control lights come on together (sometime) when I hit brakes slowly to slow down my car around 20-30km/h with a grumbling/scraping feeling sent to my feet from brake pedal (feel like rumble strip on highway). ABS & T/C lights go away if I shut off engine and restart car. It also happens if I accelerate at that speed. This issue does not happen when I hit brake hard. Has anyone experienced this issue?
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Sounds like you have a bad wheel speed sensor. Without a proper scan-tool to watch data from the wheels, it will be hard to pinpoint which wheel has the issue. It’s a very common symptom on late model GM ABS equipped vehicles,
You need to first start by pulling the codes to find out what part of the ABS system is effected. ABS and TCS are connected BTW. If you have a problem with one, both lights come on. More info here.
http://www.ericthecarguy.com/faq/solving-brake-problems
Good luck and keep us posted.
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