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ABS Kicking In on 2002 Silverado1500
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PeteCT
Novice
May 4, 2010, 9:47 AM
Post #1 of 4
(1563 views)
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ABS Kicking In on 2002 Silverado1500
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2002
Chevy
Silverado 1500
4.3L V6
The problem: I am driving my truck and when I slow down, mostly to park, the brakes don't kick in immediately and then the ABS system kicks in.
I have not tried anything yet except to check the brake fluid level and it is at max, although it does look a little dirty. When the truck is stopped the brake pedal is tight, I can only depress it an inch or two. When the truck is running it brakes normal, even at stops or red lights (EXCEPT FOR WHEN THE ABS KICKS IN), however when stopped I can push the pedal all the way to the floor with no problem. As soon as I turn the engine off the brake pedal than becomes tight again and I can only depress it an inch or two.
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Hammer Time
Ultimate Carjunky
/ Moderator
May 4, 2010, 5:03 PM
Post #2 of 4
(1555 views)
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Re: ABS Kicking In on 2002 Silverado1500
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The problem is not hydraulic. It's electrical. The ABS module is getting an incorrect speed reading from one of the wheels at low speeds for some reason and interprets that as a lock up. This can be a bad sensor, bad wheel bearing, wiring problem or they also had a lot of problem with the exciter rings rusting or cracking. You really need a professional scan tool that can capture a movie of all the ABS data at the moment this happens. That will identify which wheel is doing it.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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PeteCT
Novice
May 4, 2010, 6:53 PM
Post #3 of 4
(1545 views)
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Re: ABS Kicking In on 2002 Silverado1500
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I trust the experts, gonna bring it in on Thursday to a friends shop to get it scanned.
Thanks Again, I will post the resolution.
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Hammer Time
Ultimate Carjunky
/ Moderator
May 4, 2010, 7:00 PM
Post #4 of 4
(1541 views)
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Re: ABS Kicking In on 2002 Silverado1500
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A simple scan isn't going to tell you anything because it won't likely set a code. You have to monitor the sensor data for ABS during the failure. You have to use the movie feature so it will capture frame by frame to play back. It just doesn't update the info fast enough to see the speed glitch watching live data.
Inspecting the sensors may show something also.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on May 4, 2010, 7:01 PM)
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