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?
ABS & brake lights come on simulateously, but is intermitant problem. on 2001 Chevrolet Blazer
by brendaf in Hanover, PA on October 20, 2013
ANSWER by pushrod , October 20, 2013
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.
ANSWER by globalhelper , October 21, 2013
yes wheel speed sensor is erratic