Question about 2005 Chevrolet Silverado

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2005 silverado 2500 hd. brakes. abs engages at low speed when attempting a normal stop. once stopped transmission shifts and vehicle lunges forward.. visual check of brake system looks of normal wear. no heavy or towing is done with this vehicle. it does have aftermarket trailer brake package from previous owner.

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  • bruce mann Oct 24, 2010

    thank you for answering my question. i will try this and see if it helps.

  • bruce mann Oct 24, 2010

    2005 chevy 2500HD silverado. brakes. abs activates at low speed when stopping. pedal pushes back then goes soft. abs light on then off. has aftermarket trailer brakes however i believe it has no effect on this problem.

  • bruce mann Oct 24, 2010

    thank you.

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  • Chevrolet Master
  • 2,050 Answers

I would get your wheel sensors looked at. (Most vehicles have them incorporated into the wheel bearing for the front) If you are getting a false reading at a wheel, your ABS will engauge.

Posted on Oct 24, 2010

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  • Master
  • 749 Answers

The braking issue is most likely caused by bad wheel hub bearing or abs sensor.These have been known to have issues with rust building up between the the abs sensor and hub reluctor ring.

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 the wheel speed sensor mounting surfaces.

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in the General Information sub-section of the Service Manual.
  2. Disconnect both the front wheel speed sensor connectors at the frame and harness.
  3. Place a Digital Volt Meter (DVM) across the terminals of each wheel speed sensor connector.
  4. Rotate the wheel clockwise approximately one revolution per second. The minimum reading should be at least 350 ACmV's. If the reading is less than 350 ACmV's, remove the wheel speed sensor. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual.
  5. Plug the wheel speed sensor bore in order to prevent debris from falling into the hub during service.
  6. Clean the wheel speed sensor mounting surface using a wire brush, sand paper, emery cloth, scotch brite, or other suitable material. Be sure to thoroughly clean the wheel speed sensor surface. There should be no rust or corrosion.
  7. 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.
  8. 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 (in Canada, P/N 89022218).
  9. 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 O-ring prior to sensor installation. Use ONLY Wheel Bearing Lubricant, P/N 01051344 (in Canada, P/N 993037).
  10. Install either the original sensor or a new one in the hub. Ensure that the sensor is seated flush against the hub. Refer to the applicable Wheel Speed Sensor Replacement procedure in the ABS sub-section of the Service Manual.
  11. Place the DVM across the sensor terminals and recheck the voltage while rotating the wheel. The voltage should now read at least 350 ACmV's.

Posted on Oct 24, 2010

  • Jonathan S
    Jonathan S Oct 24, 2010

    The brakes will push back. It uses hydroboost system instead of brake vacuum booster system. Would definitely check this as an issue just because it is such a common problem. The additional trailer package probably is not affecting this issue.

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