GMC C7500 1999: SERVICE BRAKES, AIR:ANTILOCK

NHTSA Campaign ID Number: 00V232008

Production Dates: 1998-05-01 - 1999-07-31

Manufacturers Involved: General Motors, LLC

Manufacturer Campaign Number: 00076/00078

Component: SERVICE BRAKES, AIR:ANTILOCK

Potential Number Of Units Affected: 30000

Report Initiator: MFR MFR Report

VEHICLE DESCRIPTION: SCHOOL BUSES, MEDIUM DUTY TRUCKS AND TRACTORS BUILT WITH BENDIX AIR ABS WITH AN EC-17 1030R ELECTRONIC CONTROL UNIT "ECU", THERE HAVE BEEN REPORTS OF UNWANTED ABS ACTIVATION AT LOW SPEEDS CAUSED BY 1" CHAFED ABS WHEEL SPEED SENSOR WIRES ON ROTATING PARTS OR 2" A DAMAGED COMPONENT AT THE WHEEL END THAT GENERATES A CERTAIN TYPE OF ERRATIC SENSOR SIGNAL.

THIS CONDITION COULD CAUSE THE ABS ECU TO EXHAUST THE AIR AT THE AIR BRAKE MODULATORS FOR ONE OR MORE OF THE WHEELS. THIS COULD RESULT IN EXTENDED BRAKING DISTANCES AND A POSSIBLE CRASH.

DEALERS WILL REPLACE THE ABS ECU.

OWNER NOTIFICATION BEGAN DECEMBER 14, 2000 FOR THE B7 SERIES SCHOOL BUSES AND ON MARCH 15, 2001, FOR THE MEDIUM DUTY TRUCKS AND TRACTORS. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT CHEVROLET AT 1-800-222-1022 OR GMC AT 1-800-462-8782. ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT '1-888-327-4236'.