05 3500 - Anti-Lock Brake issue

[Lks2gofast]

I've got an '05 3500 that appears to be activating the anti-lock brakes at very odd times...not just when needed....sometimes at super low speeds like 5-10 rolling at a stop light/sign....or if i "slap" the pedal fast with my foot but not slamming the brakes on, the pedal will give you that pulsing motion like the anit-locks are activated....
truck is a maxed out 05 with 30k miles on it....just bought it....happy with everything else,but not sure what I can do about this one....
Saw one post about a similar issue reported at "low speed" and it mentioned cleaning and/or replacing the sensors in the hubs....
Any other "easier" thoughts????

[leolkfrm]

are you confusing anti-lock with rotor pulsation??

[stumpuller454]

i deally if you could get your truck on a scanner and drive it around, look for a sensor that is not reading a quickly as the rest, or a few Miles off, it can cause the ABS to act hypersensitive.

[mudseeker]

from alldata.....

Bulletin No.: 03-05-25-007C
Date: May 16, 2006
TECHNICAL
Subject:
Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface)

Models:
2002-2006 Cadillac Escalade, Escalade EXT
2003-2006 Cadillac Escalade ESV
1999-2006 Chevrolet Silverado
2001-2006 Chevrolet Suburban, Tahoe
2002-2006 Chevrolet Avalanche
2003-2006 Chevrolet Express
1999-2006 GMC Sierra
2001-2006 GMC Yukon, Yukon Denali, Yukon XL, Yukon Denali XL
2003-2006 GMC Savana
2003-2006 ****** H2

Supercede:
This bulletin is being revised to provide additional warranty information. Please discard Corporate Bulletin Number 03-05-25-007B (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 the wheel speed sensor mounting surfaces.
1.Raise and support the vehicle. Refer to Lifting and ******* 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 (Canadian 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 0-ring prior to sensor installation. Use ONLY Wheel Bearing Lubricant, P/N 01051344 (Canadian 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.

[merlin5577]

Originally Posted by mudseeker

from alldata.....

^What he said.

[jsech01]

Ive got the same ym&m. Does a cluster light illuminate when this happens?

[mudseeker]

no... the system does not see a problem to turn on the MIL.