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ABS functionality

phoenix89

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September 16, 2009
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Year, Model & Trim Level
'98 XLT
i'll give the whole background of the story, by my basic question will be at the bottom of this post.
i bought my 98 4.0L V6 SOHC 4x2 XLT about 5 years ago from the original owner, who had taken great care of it. the vehicle only had one problem, and that was the ABS light was on, so the ABS wasn't functioning. he said he had gotten it diagnosed at some point and that it was one of the front sensors, and that he had just never really gotten around to having it replaced. in various projects/maintenance on different parts of the vehicle, i had replaced both of the front sensors, and yet the light remained on. we hooked up a code reader that would read the ABS light, and found out that apparently it was the abs sensor that is on the rear diff.
in an oil change at Valvoline Instant one day, i had them go ahead and flush out the radiator and put new coolant in it. to my knowledge, that was the first time it had ever been done, at roughly 187K miles. well, 6 weeks later, the check engine light came on and threw a P0125 code, which is a closed loop coolant problem, saying that the coolant temp was consistently low. well when the check engine light came on, the ABS light turned off. which i found to be a bit weird. we eventually concluded that it was the thermostat. so i replaced the thermostat yesterday morning, and the engine seems to be a lot more healthy now, but the weird thing is the ABS light stayed off.
so at a friends house on a gravel road that was wet from the melting snow, i tried stopping up short and locking the wheels up to see what it would do, while he watched the wheels from the outside. from his description, the front wheels stayed locked, and the back wheels locked, then released, rolled for about one revolution, and then locked up, then rolled for a revolution.

so to finally arrive at the point for this post. I'm basically just curious as to how the ABS system is supposed to act when you lock the wheels up. i have no idea since the entire 5 years i've owned the vehicle, the ABS system was off. i'm not sure how it's supposed to feel in the vehicle either, because a toyota camry that i owned previously, you could feel the whole car pulse when the abs system activated, and when i locked the wheels up in my explorer, i couldn't really feel anything but the tires being pushed across rough gravel. searches for videos proved unsuccessful, so i was curious if anyone here knew.
 



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My guess is the bulb burnt out.

You'll feel the ABS kick in. It produces a nasty vibration and slight push back on your brake pedal.

Did you hear or feel that happen?
 






thats what i thought it should feel like. thats what the Camry i had did.
i'm not sure about the bulb just being out. considering the life of the vehicle that would be an amazing coincidence for the abs light to burn out right when the check engine light came on for the coolant problem haha. but also, on that same note, how/why would the check engine light coming on fix the abs problem?
it was rough when i tried to lock the wheels up, because i was on wet gravel, but i didn't feel the vehicle or the pedal pulse at all like it should. i guess i need to find a good open parking lot somewhere and get going and just outrightly lock them up and see what it does. i just wanted to check with the folks here real quick and double check that you should feel it and all 4 wheels should pulse when you loose traction
 






the simpliest way to check the bulb IS to turn your key to ON.... the bulb check will light all "appropriate" bulbs as a check AND the ABS WILL be one. As for "fixed", how do you know it is "fixed" when it sounds like it isn't operating the way it should?????
 






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