IllustrationWE HAVE NOTICED THAT AREAS ON THE TRUCK WHERE RUSTING OUT. BUT WHEN THE BRAKES FAILED DUE TO THE LINES BEING RUSTED THROUGH I WAS VERY UPSET. I DO REALIZE THAT YOU MIGHT HAVE THIS FROM NORMAL WEAR BUT THE RUSTING IS EXTENSIVE.I WANT TO FILE A COMPLAINT AS I DO HOPE THAT THIS WILL NOT CAUSE AN ACCIDENT FOR SOMEONE ELSE. *JS
1999 Chevrolet Silverado 1500
Owner reports · Recalls · Investigations
Similar to other model years
Owner complaints for the 1999 Chevrolet Silverado 1500 do not stand out strongly from the model-year median of 525.
About this comparison →How this year compares
Owner complaints by model year
Compare all Silverado 1500 years →Counts vary with age, sales and reporting. They are not failure rates.
What owners reported most
All reported categories
Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
130–25K
3725–50K
6150–75K
6275–100K
141100–150K
104150K+
418 reports with mileage · 169 unknown
NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.
What to inspect
Issues worth paying extra attention to based on owner reports.
- Service Brakes, Hydraulic. Review the 222 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Service Brakes. Review the 126 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Structure. Review the 53 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
43 crash reports5 fire reports18 injury reports
Service Brakes, Air complaints
12 reportsI HAVE 1999 CHEVY SILVERADO 1500 TRUCK. THE BRAKES DO NOT WORK AT LOW SPEEDS. TWO YEARS AGO I RAN INTO THE BACK OF MY OWN SECOND VEHICLE, AS IT WAS PARKED IN MY DRIVEWAY, WHEN MY TRUCK WOULD NOT STOP AT SPEEDS LOWER THAN 10 MPH. I TOOK THE TRUCK INTO THE CHEVY DEALER AND THEY FIXED THE PROBLEM FOR FREE BECAUSE OF A RECALL. I…
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I HAVE 1999 CHEVY SILVERADO 1500 TRUCK. THE BRAKES DO NOT WORK AT LOW SPEEDS. TWO YEARS AGO I RAN INTO THE BACK OF MY OWN SECOND VEHICLE, AS IT WAS PARKED IN MY DRIVEWAY, WHEN MY TRUCK WOULD NOT STOP AT SPEEDS LOWER THAN 10 MPH. I TOOK THE TRUCK INTO THE CHEVY DEALER AND THEY FIXED THE PROBLEM FOR FREE BECAUSE OF A RECALL. IT IS 2 YEARS LATER, AND THE TRUCK IS DOING THE SAME THING AGAIN. IT WILL NOT STOP AT LOW SPEEDS. I BROUGHT THE TRUCK BACK IN AND WAS TOLD THAT THE RECALL WOULD NOT COVER ANOTHER INSPECTION. I WAS ALSO TOLD THAT THE WHEEL BEARING SENSOR HAD BEEN CLEANED ACCORDING TO THE RECALL AND THAT IS WAS POSSIBLE CORROSION HAD BUILT UP AGAIN. I TOLD THE DEALER THAT IT WAS UNACCEPTABLE THAT EVERY 2 YEARS THE BREAKS JUST STOP WORKING.*CN
WHEN PUSHING THE BRAKE PEDAL, THERE IS A RESISTANCE, A GRINDING NOISE, AND TRUCK DOES NOT STOP. IF YOU LET OFF THE PEDAL AND IMMEDIATELY PUSH IT AGAIN, PROBLEM IS STOPPED. VERY STRESSFUL DRIVING THIS TRUCK, WHICH IS OUR ONLY VEHICLE AT THIS TIME. NUMEROUS TIMES WE HAVE ALMOST REAR ENDED CARS OR HIT BUILDINGS IN PARKING SPACES. W…
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WHEN PUSHING THE BRAKE PEDAL, THERE IS A RESISTANCE, A GRINDING NOISE, AND TRUCK DOES NOT STOP. IF YOU LET OFF THE PEDAL AND IMMEDIATELY PUSH IT AGAIN, PROBLEM IS STOPPED. VERY STRESSFUL DRIVING THIS TRUCK, WHICH IS OUR ONLY VEHICLE AT THIS TIME. NUMEROUS TIMES WE HAVE ALMOST REAR ENDED CARS OR HIT BUILDINGS IN PARKING SPACES. WE TOOK IT TO A GARAGE, THEY REPLACED BOTH REAR CALIPERS AT $375.00, BEFORE I EVEN PULLED OUT OF THE PARKING LOT THE BRAKES DID IT AGAIN. NOW WE CAN'T AFFORD TO REPLACE THE ABS SENSOR DUE TO THE CALIPER BILL. WE LIVE IN KENTUCKY, WHY WEREN'T WE INCLUDED IN THE RECALL? IF OHIO AND INDIANA GET SNOW, SO DO WE AND THEY WERE IN THE RECALL.
I HAVE A 1999 CHEVY SILVERADO K1500 EXTENDED CAB. I BOUGHT IT IN THE SUMMER OF 2002. BY JANUARY OF 2003, I BEGAN HAVING TROUBLE WITH THE ABS KICKING IN WHEN IS WAS SLOWING DOWN TO A STOP. THE ROADS WERE NOT WET OR SLIPPERY AND I ALMOST WENT INTO TRAFFIC SEVERAL TIMES (I HAVE ALSO ALMOST HIT A PARKED CAR PULLING IN A PARKING S…
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I HAVE A 1999 CHEVY SILVERADO K1500 EXTENDED CAB. I BOUGHT IT IN THE SUMMER OF 2002. BY JANUARY OF 2003, I BEGAN HAVING TROUBLE WITH THE ABS KICKING IN WHEN IS WAS SLOWING DOWN TO A STOP. THE ROADS WERE NOT WET OR SLIPPERY AND I ALMOST WENT INTO TRAFFIC SEVERAL TIMES (I HAVE ALSO ALMOST HIT A PARKED CAR PULLING IN A PARKING SPACE, AND ALMOST WENT OVER A STEEP EMBANKMENT SINCE THEN). I PAID OVER $300 IN FEBRUARY 2003 TO HAVE THEM FIXED AND THAT LASTED UNTIL FEBRUARY OF 2004. WHEN I ALMOST WENT OVER THE STEEP EMBANKMENT AT MY LOCAL GROCERY STORE WHEN I WAS PULLING INTO A PARKING SPACE, I DECIDED TO PULL THE FUSE. THE ONLY PROBLEM WITH THIS IS THAT YOU DON'T HAVE CRUISE ANY LONGER. I FINALLY DECIDED I HAD TO GET IT FIXED BECAUSE WE WANTED THE CRUISE FEATURE SO I GOT IT FIXED IN DECEMBER OF 2004. BY THAT TIME, THE CHEVROLET DEALERS ARE FINDING OUT THERE IS A PROBLEM AND THEY JUST NEED TO CLEAN OUT THE SENSOR WHICH NOW COSTS ABOUT $75 (THE DEALERSHIP I BOUGHT THE TRUCK FROM WOULDN'T EVEN ADMIT THERE WAS A PROBLEM). THE BIG PROBLEM IS THAT I DO NOT KNOW WHEN THEY WILL GIVE ME PROBLEMS AGAIN AND I AM STILL A LITTLE AFRAID TO DRIVE MY TRUCK. I HAVE 2 YOUNG CHILDREN AND I WOULD HATE TO BE IN AN ACCIDENT AND HURT THEM BECAUSE OF SOMETHING THAT CHEVY KNOWS ABOUT AND REFUSES TO DEAL WITH. I HAVE BEEN CHECKING ONLINE, AND I HAVE NOTICED A LOT OF PEOPLE ARE HAVING THE SAME PROBLEM. THIS IS A SERIOUS PROBLEM THAT NEEDS TO BE ADDRESSED BEFORE SOMEONE LOSES THEIR LIFE OVER IT.
1999 CHEVROLET 1500 EXPERIENCING PROBLEMS WITH THE BRAKES.*MR CUSTOMER STATED ABS LIGHT KICKS ON WHEN APPLYING THE BRAKE AND VEHICHE WILL NOT COME TO A COMPLETE STOP. REMOVED BOTH FRONT SENORS, REINSTALLED AND RECHECKED, OK. *BF
ANTILOCK BRAKES ACTIVATE AT UNDER 10 MILES AN HOUR ON DRIVE PAVEMENT CAUSING STOPING DISTANCE TO SIGNIFICANTLY INCREASE. SEVERAL TIMES HAD A NEAR ACCIDENT. CHEVY CLEANED AND REPAIRED FRONT WHEEL SPEED SENSORS AND THEN REPLACED THE LEFT FRONT. TOTAL COST OF REPAIRS WAS $650
ABS MODULE HAS GONE BAD ON 1999 SILVERADO EXTENDED CAB. THIS IS A COMPUTER COMPONENT AND STOPS TRUCK FROM BRAKING PROPERLY. CAUSES TRUCK TO GO SIDEWAYS IF SUDDENLY HAVE TO USE BRAKES.*AK
THE ABS WENT OUT ON MY 1999 CHEVROLET SIVERADO, DEALER STATES CAN'T KEEP PART ON SHELF(SO MANY GOING OUT). DEALER WANTS $1200 PLUS INSTALLATION. MANY FRIENDS HAVE SAME. 40,000 MILES AND WINTERS HERE, NOT SAFE TO LET MY WIFE DRIVE W/CHILDREN IN TRUCK. DRIVING WITHOUT ABS AT THIS TIME. *AK
ABS BRAKE MODULE / MOTOR PUMP FAILURE ABS LIGHT COMES ON AND STAYS ON AND MOTOR UNDERNEATH TRUCK RUNS ALL THE TIME. HAD TO DISCONNECT THE 60 AMP FUSE TO STOP THE MOTOR /PUMP
WHILE APPLYING THE BRAKE, THE ABS BRAKING SYSTEM APPEAR ON THE PANEL. WITHOUT BRAKES, THE ABS MOTOR CONTINUE TO RUN UNTIL THE CONSUMER DISCONNECTED THE SYSTEM. DEALER IS AWARE OF THE PROBLEM. PH
Official recalls
0No recalls in this snapshot.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
NHTSA investigations
2EA04011 · Parking Brake Failure
Opened Apr 9, 2004 · Closed May 10, 2005
Status: closed (inferred from source dates) · Parking Brake; Parking Brake:conventional; Parking Brake:conventional:mechanical; Parking Brake:conventional:mechanical:linkage And Cable
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Additional source detail variants (4)
Parking Brake:conventional
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Parking Brake:conventional:mechanical
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Parking Brake:conventional:mechanical:linkage And Cable
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Parking Brake
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
PE03057 · Parking Brake Failure
Opened Dec 8, 2003 · Closed Apr 9, 2004
Status: closed (inferred from source dates) · Parking Brake
ODI OPENED PE03-057 TO ASSESS PARKING BRAKE INEFFECTIVENESS IN THE SUBJECT VEHICLES.THESE VEHICLES ARE EQUIPPED WITH FOUR WHEEL DISC BRAKES THAT INCORPORATE A SINGLE-SHOE DRUM-IN-HAT PARKING BRAKE INDEPENDENT OF THE SERVICE BRAKES.COMPLAINT AND WARRANTY DATA INDICATE THAT THE PARKING BRAKE LININGS TEND TO WEAR OUT EARLY IN THE LIFE OF THE VEHICLE (AT AN AVERAGE OF 24 MONTHS IN SERVICE), REDUCING THE PARKING BRAKE SYSTEM'S TORQUE BELOW THAT NEEDED TO IMMOBILIZE THE VEHICLE.GM HAS ATTRIBUTED THIS ACCELERATED WEAR TO FOREIGN MATERIAL INTRUSION AND A FAILURE OF THE BRAKE SHOE TO PROPERLY SELF-CENTER WITHIN ITS BRAKE DRUM.EFFECTIVE WITH THE START OF MY 2003 PRODUCTION, A NEWER REDUCED FORCE HOLD-DOWN CLIP WAS INTRODUCED TO FACILITATE BRAKE SHOE DISENGAGEMENT FROM THE DRUM SURFACE.THIS PART IS ALSO AVAILABLE AT THE SERVICE LEVEL FOR THE MY 1999-2002 VEHICLES.GM HAS INDICATED THAT THE PAKING BRAKE IS INTENDED TO OPERATE IN CONJUNCTION WITH THE TRANSMISSION TO IMMOBILZE PARKED VEHICLES, AND THAT IN MANY CASES, ACCELERATED PARKING BRAKE LINING WEAR IS CAUSED BY ROUGH USE, VEHICLE MODIFICATIONS, AND DRIVING WITH THE PARKING ENGAGED. ODI HAS UPGRADED THE PRELIMINARY EVALUATION TO AN ENGINEERING ANALYSIS TO GATHER FURTHER INFORMATION CONCERNING PARKING BRAKE USAGE FACTORS AND THE CIRCUMSTANCES SURROUNDING THE SEVENTEEN REPORTED VEHICLE CRASHES.