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ABS recall.....NHTSA Campaign ID number : 05V379000
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Post ABS recall.....NHTSA Campaign ID number : 05V379000 
There was a TSB on GMT400's over this exact same thing.
http://www-odi.nhtsa.dot.gov/cars/problems/recalls/results.cfm?SearchType=QuickSearch&rcl_ID=05V379000&summary=true

Since this recall: 'NHTSA Campaign ID number : 05V379000' only
covers GMT800/900's, the DIY fix:

Is to remove the ABS sensor and take off the rust from behind the
sensor and the mounting surface on the hub.

Then use anti-seize that has metal fillers (copper or aluminum).

Dumb, as that completes the circuit. Better would have been for
them to have a ground wire & connector contact
on the plug, but that would have cost a few bucks more....

Text:

Report Date : May 4, 2009 at 11:17 AM
NHTSA Campaign ID number : 05V379000


Vehicle Make / Model: Model Year(s):
CHEVROLET / AVALANCHE 2002
CHEVROLET / SILVERADO 1999-2002
CHEVROLET / SUBURBAN 2000-2002
CHEVROLET / TAHOE 2000-2002
GMC / SIERRA 1999-2002
GMC / YUKON 2000-2002
GMC / YUKON XL 2000-2002
Manufacturer: GENERAL MOTORS CORP. Mfr's Report Date: AUG 29, 2005
NHTSA CAMPAIGN ID Number: 05V379000
PE05020
NHTSA Action Number: PE05020
Component: SERVICE BRAKES, HYDRAULIC:ANTILOCK
Potential Number of Units Affected: 1353718
Summary:
CERTAIN PICKUP TRUCKS AND SPORT UTILITY VEHICLES MAY EXPERIENCE UNWANTED ANTILOCK BRAKE SYSTEM (ABS) ACTIVATION. THIS CONDITION IS MORE LIKELY TO OCCUR IN ENVIRONMENTALLY CORROSIVE AREAS. THIS RECALL WILL BE LAUNCHED IN THE "SALT BELT" STATES OF CONNECTICUT, DELAWARE, ILLINOIS, INDIANA, IOWA, MARYLAND, MASSACHUSETTS, MAINE, MICHIGAN, MINNESOTA, MISSOURI, NEW HAMPSHIRE, NEW JERSEY, NEW YORK, OHIO, PENNSYLVANIA, RHODE ISLAND, VERMONT, WEST VIRGINIA, WISCONSIN AND THE DISTRICT OF COLUMBIA ONLY.
Consequence:
THIS CAN CAUSE INCREASED STOPPING DISTANCES DURING LOW-SPEED BRAKE APPLICATIONS, WHICH COULD RESULT IN A CRASH.
Remedy:
DEALERS ARE TO REMOVE THE WHEEL SPEED SENSOR AND THOROUGHLY CLEAN THE WHEEL SPEED SENSOR MOUNTING SURFACE ON THE BEARING, APPLY RUST INHIBITOR TO THE CLEANED SURFACE, GREASE THE MOUNTING SURFACE, REINSTALL THE WHEEL SPEED SENSOR, AND CHECK THE PEAK-TO-PEAK OUTPUT VOLTAGE TO ENSURE THE WHEEL SPEED SIGNAL IS WITHIN SPECIFICATIONS. THE RECALL BEGAN SEPTEMBER 22, 2005. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438 OR GMC AT 1-866-996-9463.
Notes:
GM RECALL NO. 05068. GM REVISED THE INVOLVED VEHICLES BY AMENDING THE ORIGINAL 573 REPORT ON OCTOBER 4, 2005. GM REVISED THE ORIGINAL 573 REPORT ON DECEMBER 16, 2005, TO INCLUDE ADDITIONAL STATES AND VEHICLE POPULATION. CUSTOMERS MAY ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S VEHICLE SAFETY HOTLINE AT 1-888-327-4236 (TTY 1-800-424-9153), OR GO TO HTTP://WWW.SAFERCAR.GOV.

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I find it very hard to believe that the chassis would be used as a sensor return for the wheel speed sensor. In fact, I'd bet a lot of money that's not the case. There must be some other reason for using that type of anti-seize. Perhaps they're worried about capacitive coupling between the sensor and the mount point.

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