Question about 2002 GMC Sierra

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Anti lock activating at low speeds on dry pavement 2002 gmc Z71

I checked the front pads and rotors, I noticed the inside of the rotor on BOTH sides not wearing evenly (partial contact). The front pads were in very good condition and the rotors looked good besides the uneven wear. This should not cause the anti lock system to activate, should it? The rear pads were low and I replaced them but that did not help... actually made it worse. There are recalls for this issue but my truck is showing no outstanding recalls due according to GMC and wheel sensors are $130 ea.I dont mind spending the money to fix it but I just dont want to throw parts at it

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  • bwatson247 Jul 20, 2009

    Thanks for pointing me in the right direction. I took the wheel assy. apart and removed the sensors and cleaned the surface area with sand paper and applied anti corrosive spray and cleaned the sensor its self with degreaser. I made sure that the sensor seated ALL the way down, just before the parts store opened, saved me $130 or more. Works great!!! I got lucky, I hope this helps others.
    Thanks again!!!


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You need someone to scan it for codes but it sounds like the speed sensor for one of the wheels is droping the signal to the abs unit at lower speeds they can see that with the data stream with a scanner

Posted on Jul 20, 2009

Testimonial: "I removed the wheel sensors and cleaned the rusty mounting surface and applied no corrode spray to the surface, works great!!! "

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