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Q:

ABS & brake lights come on simulateously, but is intermitant problem. on 2001 Chevrolet Blazer

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Not always on when vehicle started, but usually does come on somewhere along the trip. Have noticed that it sometimes comes on if hit pothole or railroad track, like maybe a vibration can trigger it. Is this just a light problem? Or is it a brake issue?
(2) Answers
Most likely a wheel speed sensor problem, scan test will confirm but scanner really needs to be connected at the time of the falt! May have to let a mechanic drive it with the scanner hooked up until this happens, that is IF no memory codes can be found.
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yes wheel speed sensor is erratic
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