Question about 2000 Chevrolet Astro

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The ABS sounds like it is coming on frequently in our 1995 Astro. It comes on when slowing even from slow speeds right before it stops. It has gradually gotten worse till now it is not stopping well at all. We are currently replacing the adjuster on the rear drum brakes as well as the hardware kit on the rear wheels. When that is fixed, should it eliminate the ABS problem? Front brakes were just inspected and are fine. I heard that the sensors for the ABS in the transfer case can get rusted (we have a lot of rust under the body) and you can clean them and they should work fine. Is this true? What else can we check?

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  • Master
  • 749 Answers

The sensor in the differential is a magnet it can crack and go bad but doubtfully rust out in the differential.Rear adjusters are probably not going to help with the ABS activating.Is this an awd or rwd? Things I would check would be the exciter rings on the back of the front rotors for missing teeth or the front abs sensors that have collected alot of metal shavings or debris. When the air gap between the exciter "abs rings" and the sensor changes it can cause the abs to activate especially at lower speeds and parking lot manuevers. This exciter rings on the rotors only apply to the rear wheel drive version.If its an all wheel drive the exciter rings will be on the axle or in the bearing hub assembly.The sensor may actually be bolted to the bearing in the AWD.GM had issues with where the sensors that bolt up in the AWD where rust would build up on the shim between the the sensor and the exciter ring increasing the air gap.The sensor in the rear diff can collect metal shavings from from the differential as well in both the awd and rwd.You can try and clean them sometimes they will work afterwards but not always. If this is the rwd version the exciters rings on the rotors could be bent or have become loose.

Posted on Jul 11, 2010

  • 2 more comments 
  • leonardfa296 Jul 11, 2010

    It is AWD, Can you explain how to find the sensor and exciter rings and what they look like?

  • Jonathan S
    Jonathan S Jul 12, 2010

    In the awd they are of the bearing hub assembly.You will need to remove the caliper and rotor and you will be able to see the Abs sensor if there is alot of rust there remove the sensors by removing the allen key screw holding them in place.Since these are sealed chances that the exciters are damaged is pretty slim.If you see alot of rust between the sensor and the bearing you will need to file or sand the area where the sensor mounts.You will also need to plug the hole where the sensor goes to avoid debris going into the bearing.

  • Jonathan S
    Jonathan S Jul 12, 2010

    When trying to remove the sensors try gently twisting them to get them to loosen up.

  • Jonathan S
    Jonathan S Jul 12, 2010

    http://www.1aauto.com/1A/wheel-bearing-h... here is a picture of what the hub assembly looks like and the wire coming off is the abs sensor

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