Illustration1999 CHEVY SILVERADO ABS LIGHT CAME ON AND NOISE ALONG WITH IT. I KNEW WHAT IT WAS RIGHT AWAY BECAUSE I REPLACED THE ABS MODULE ONCE BEFORE AT 40000 MILES. CHEVY GARAGE CONFIRMED. RIDICULOUS AND UNSAFE OF CHEVY NOT TO ISSUE A RECALL. *TR
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
What owners actually said
587 reportsMY BRAKE LINE ON MY 1999 CHEVY SILVERADO BUSTED WHILE TRYING TO STOP. ALL THE BRAKE LINES ARE RUSTED UNDER THE DRIVER SIDE RUNNING ALONG THE FRAME. *TR
I HAVE A 1999 CHEVY SILVERADO, THAT HAD BRAKE FAILURE. I PRESSED THE BRAKES AND THE PEDAL WENT TO THE FLOOR. THERE WAS A LEAK IN A RUSTED BRAKE LINE NEXT TO THE ABS MODULE. ALL OF THE LINES LOOK VERY CORRODED AND THE WHOLE UNDERCARRIAGE LOOKS VERY CORRODED. I WAS GOING TO REPLACE THE BRAKE LINE MYSELF, BUT ALL OF THE LINES A…
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I HAVE A 1999 CHEVY SILVERADO, THAT HAD BRAKE FAILURE. I PRESSED THE BRAKES AND THE PEDAL WENT TO THE FLOOR. THERE WAS A LEAK IN A RUSTED BRAKE LINE NEXT TO THE ABS MODULE. ALL OF THE LINES LOOK VERY CORRODED AND THE WHOLE UNDERCARRIAGE LOOKS VERY CORRODED. I WAS GOING TO REPLACE THE BRAKE LINE MYSELF, BUT ALL OF THE LINES ARE SO RUSTED, I DON'T KNOW IF I CAN. *TR
STEERING DIFFICULTLY IN ONE DIRECTION ONLY. MY TRUCK DOES NOT WANT TO TURN TO THE RIGHT. IT STEERS TO THE LEFT FINE. THIS HAS BEEN AN ON-GOING PROBLEM AND I AM NOT SURE WHAT NEEDS TO BE FIXED. *TR
1999 CHEVY SILVERADO EXTENDED CAB FOUR WHEEL DRIVE. WAS DRIVING THE OTHER DAY WHEN I LOST MY BRAKES COMPLETELY. THANKFULLY WAS ABLE TO COAST TO A SAFE SPOT AND I WAS ON A ROAD WITH NO TRAFFIC. THE REAR BRAKE LINE WAS RUSTED OUT RIGHT BEHIND THE GAS TANK ON THE DRIVE SIDE, AND UPON FURTHER INSPECTION ALL OF THE BRAKE LINES NEED R…
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1999 CHEVY SILVERADO EXTENDED CAB FOUR WHEEL DRIVE. WAS DRIVING THE OTHER DAY WHEN I LOST MY BRAKES COMPLETELY. THANKFULLY WAS ABLE TO COAST TO A SAFE SPOT AND I WAS ON A ROAD WITH NO TRAFFIC. THE REAR BRAKE LINE WAS RUSTED OUT RIGHT BEHIND THE GAS TANK ON THE DRIVE SIDE, AND UPON FURTHER INSPECTION ALL OF THE BRAKE LINES NEED REPLACING. WHOLE UNDERCARRIAGE OF VEHICLE IS RUSTED OUT, EXTENSIVE CORROSION ON EVERYTHING. ROCKER PANELS WERE RUSTED OUT ALONG WITH THE BEDSIDES AND CAB CORNERS. BRAKE LINE IS MY MAIN CONCERN THOUGH, AS THIS IS A MAJOR PROBLEM ON A LOT OF THEIR VEHICLES. *TR
HIT BRAKES HARD BECAUSE TRAFFIC NO BRAKES. I MISSED THE CAR IN FRONT AND WAS ABLE TOO EXIT EXPRESS WAY WITH MY WIFE & 3 YOUNG ADULTS (MY SON & TWO DAUGHTER IN THE BACK SEAT. IT BLEW UNDER MY DRIVERS SEAT . WHEN I WENT TO REPAIR ALL BRAKE LINES NEEDS TO BE REPLACED. PLUS THE MORE I LOOK ON-LINE AND PEOPLE I TALK TOO EVERYONE IS H…
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HIT BRAKES HARD BECAUSE TRAFFIC NO BRAKES. I MISSED THE CAR IN FRONT AND WAS ABLE TOO EXIT EXPRESS WAY WITH MY WIFE & 3 YOUNG ADULTS (MY SON & TWO DAUGHTER IN THE BACK SEAT. IT BLEW UNDER MY DRIVERS SEAT . WHEN I WENT TO REPAIR ALL BRAKE LINES NEEDS TO BE REPLACED. PLUS THE MORE I LOOK ON-LINE AND PEOPLE I TALK TOO EVERYONE IS HAVING THE SAME PROBLEM. BODY&FRAME RUST ,WHAT CAN I DO? *TR
1999 SILVERADO 1500 4WD TRUCK WITH RUSTING BRAKE LINES. *TR
THERE IS AN ISSUE WITH THE BRAKE SYSTEM ON THE 2001 CHEVROLET SILVERADO PICK-UP THAT CHEVROLET HAS FAILED TO ADDRESS SATISFACTORILY. THE TRUCKS WERE RECALLED DUE TO AN ISSUE WITH THE SPEED SENSOR THAT WOULD CAUSE THE BRAKES TO FAIL. IN 2005 CHEVROLET RECALLED THE TRUCKS FOR THIS ISSUE AND SUPPOSEDLY PUT RUST PROTESTANT ON THE SP…
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THERE IS AN ISSUE WITH THE BRAKE SYSTEM ON THE 2001 CHEVROLET SILVERADO PICK-UP THAT CHEVROLET HAS FAILED TO ADDRESS SATISFACTORILY. THE TRUCKS WERE RECALLED DUE TO AN ISSUE WITH THE SPEED SENSOR THAT WOULD CAUSE THE BRAKES TO FAIL. IN 2005 CHEVROLET RECALLED THE TRUCKS FOR THIS ISSUE AND SUPPOSEDLY PUT RUST PROTESTANT ON THE SPEED SENSOR TO PROTECT IT FROM FAILING. IN 2010 I WAS NEARLY INVOLVED IN A TRAFFIC CRASH WHEN MY BRAKES FAILED. THE DEALERSHIP ADVISED THAT THE SPEED SENSOR WENT BAD. I CONTACTED CHEVROLET AND THEY FAILED TO PROPERLY ADDRESS THIS SITUATION. IN DOING RESEARCH I FOUND THAT THIS IS NOT AN ISOLATED INCIDENT AND NEEDS TO BE ADDRESSED BEFORE SOMEONE IS KILLED OR INJURED AS A RESULT OF FAULTY BRAKES. *TR
1999 CHEVROLET SILVERADO 1500 4WD STANDARD CAB 4.3 V-6 -FAILURE IN BRAKE LINE , I WAS STOPPED IN LINE AT DRIVE THRU AND FELT BRAKE PEDAL GO DOWN AND HEARD BREAK FLUID SQUIRT FROM LINE, INVESTIGATED PROBLEM AND FOUND A HOLE IN LINE DUE TO RUST , LOCATION OF PROBLEM WAS BELOW DRIVERS DOOR WHERE LINE RUNS ALONG FRAME, WILL HAVE TO…
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1999 CHEVROLET SILVERADO 1500 4WD STANDARD CAB 4.3 V-6 -FAILURE IN BRAKE LINE , I WAS STOPPED IN LINE AT DRIVE THRU AND FELT BRAKE PEDAL GO DOWN AND HEARD BREAK FLUID SQUIRT FROM LINE, INVESTIGATED PROBLEM AND FOUND A HOLE IN LINE DUE TO RUST , LOCATION OF PROBLEM WAS BELOW DRIVERS DOOR WHERE LINE RUNS ALONG FRAME, WILL HAVE TO REPLACE LINE, WILL KEEP OLD LINE FOR INSPECTION IF NEEDED. *TR
TL* THE CONTACT OWNS A 1999 CHEVROLET SILVERADO 1500. WHILE TURNING RIGHT AT APPROXIMATELY 15 MPH, THE STEERING WHEEL BECAME EXTREMELY STIFF. THE CONTACT STATED THAT THE VEHICLE WOULD EASILY STEER TO THE LEFT BUT STEERING TO THE RIGHT WAS VERY DIFFICULT. THE MANUFACTURER WAS NOTIFIED AND INFORMED THE CONTACT HIS VEHICLE WAS NOT…
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TL* THE CONTACT OWNS A 1999 CHEVROLET SILVERADO 1500. WHILE TURNING RIGHT AT APPROXIMATELY 15 MPH, THE STEERING WHEEL BECAME EXTREMELY STIFF. THE CONTACT STATED THAT THE VEHICLE WOULD EASILY STEER TO THE LEFT BUT STEERING TO THE RIGHT WAS VERY DIFFICULT. THE MANUFACTURER WAS NOTIFIED AND INFORMED THE CONTACT HIS VEHICLE WAS NOT INCLUDED IN THE RECALL ASSOCIATED WITH NHTSA CAMPAIGN ID NUMBER 98V242000: STEERING: GEAR BOX (OTHER THAN RACK AND PINION). THE VEHICLE WAS NOT REPAIRED. THE FAILURE AND CURRENT MILEAGE WERE 150,000.
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.