Question about 2000 Chevrolet Blazer

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2000 Blazer ABS engaging

Recently changed front passenger side wheel bearing (2nd time) and now the ABS activates just before I come to a complete stop. Why? Solutions? (replacement went smooth - no problems)

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  • gordoe05 Dec 10, 2008

    I think its only being activated by the passenger side but I'm not 100% sure. Wheel hub has wire that plugs directly into a wire coming from the truck. Doesn't look like wire originates from anything removable. Hub/ bearing came assembled as one unit. What's this exciter ring theory? Wheel bearing was pretty torn up when it finally went, maybe it damaged it.

  • Anonymous Mar 12, 2014

    fixed the front wheel bearing of my premio and the ABS light comes on

  • Anonymous Mar 22, 2014

    switch replaced, blower fan replaced some other part on fire wall replasced blower worked intermittanly for a short time but will not come on now

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What about the drivers side? and does it have a removeable wheel speed sensor from the wheel hub? if so, maybe broken exciter ring on axle shaft on one of the front axles

Posted on Dec 09, 2008

  • autodr
    autodr Dec 10, 2008

    on alot of front drive or 4x4 vehicles, at the end of the axle shaft in front, there is a toothed gear on it that the wheel speed sensor "reads" as it rotates to compute the speed. all wheel speeds on all 4 wheels have to be the same. if the toothed gear on the shaft breaks and spreads the gap, the wheel speed sensor reads inaccurately. causing your situation. if you have an a/c current volt meter, disconnect the wheel speed sensor connector. probing the 2 wires on the sensor. spin wheel by hand, moderate speed. the reading is under 350 a/c mv, then replace sensor. you can also ck sensor ohms to see which side is out of spec.

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1 Answer

Front wheel sensors


The ABS sensor is located in the wheel bearing, so i would check the wiring and pigtails there first and check your wheel bearings, if they are bad it could be activating your abs. If these issues are ok, then get the ABS computer checked

Mar 06, 2012 | 1998 GMC Jimmy

1 Answer

ABS and BRAKE light on


Hi Timothy:
You will want to have it scanned for any trouble codes to see what area the problem may be in. Just let us know what the code(s) are and we can go from there.

The only thing that I can figure is that it may be that the ABS is activating at low speeds, as there is a bulletin that mentions that with no trouble codes. Wheel speed sensors, dirty.

Bulletin No.: 02-05-25-006B
Date: January 05, 2006
TECHNICAL
Subject: Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface)

Models:
1999-2000 Cadillac Escalade
1995-1999 Chevrolet Silverado (Old Style)
1995-2000 Chevrolet Suburban, Tahoe (Old Style)
1995-2003 Chevrolet Astro Van, Blazer, S10
1995-1999 GMC Sierra (Old Style)
1995-2000 GMC Yukon, Yukon XL (Old Style)
1995-2001 GMC Envoy, Jimmy
1995-2003 GMC Safari Van, Sonoma
1995-2001 Oldsmobile Bravada

Supercede: This bulletin is being revised to update the correction and warranty information. Please discard Corporate Bulletin Number 02-05-25-006A (Section 05 - Brakes).

Condition: Some customers may comment on ABS activation at low speeds, usually below 8 km/h (5 mph). Upon investigation, the technician will find no DTCs set.

Cause: The cause of this condition may be an increased air gap between the wheel speed sensor and the hub reluctor ring due to rust and debris built up on the sensor mounting surface.

Correction:
Measure AC voltage and clean wheel speed sensor mounting surfaces.
1. Raise the vehicle on a hoist.
2. Disconnect both the front wheel speed sensor harness connectors.
3. Place a DVM across the terminals of each sensor connector.
4. Rotate the wheel with hand speed and measure the ACmV's. The reading should be at least 350 ACmV's.
5. If the reading is between 200 and 350 ACmV's, remove the wheel, caliper and rotor in order to gain access to the speed sensor.
6. Remove the wheel speed sensor and plug the hole to prevent debris from falling into the hub during service.
7. Clean the wheel speed sensor mounting surface using a wire brush, sand paper, emery cloth, ScotchBrite(TM) or other suitable material. Be sure to thoroughly clean the wheel speed sensor surface. There should be no rust or corrosion.
8. Check the sensor head to determine if it has been warped/distorted due to the corrosion build up or other causes. Check the mounting surface on the sensor head for flatness by placing it on the edge of a metal machinists scale or other suitable straight edge to measure the flatness. Check the sensor for flatness in multiple (minimum 3) positions/directions. If the sensor head is distorted, replace the sensor.
9. Apply (spray) two thin coats of the specified rust penetrating lubricant (corrosion inhibitor) to the complete sensor mounting surface on the bearing hub. Allow to dry for 3-5 minutes between coats. Use ONLY Rust Penetrating Lubricant, P/N 89022217 (Canadian P/N 89022218).
10. When the corrosion inhibitor is dry to the touch (about 10 minutes), apply a thin layer of bearing grease to the hub surface and sensor 0-ring prior to sensor installation. Use ONLY Wheel Bearing Lubricant, P/N 01051344 (Canadian P/N 993037).
11. Install either the original sensor or a new one in the hub and secure the sensor. Ensure that the sensor is seated flush against the hub.
12. Install the rotor, the caliper and the wheel.
13. Place the DVM across the sensor terminals and recheck the voltage while rotating the wheel by hand. The voltage should now read at least 350 ACmV's.

Hope this helps; also keep in mind that your feedback is important and I will appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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1 Answer

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2 Answers

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