IllustrationELECTRONIC BRAKE CONTROL MODULE HAS FAILED, DISABLING THE VEHICLE'S ANTI-LOCK BRAKE SYSTEM. CHEVROLET WANTS $1500 FOR REPAIR AND IT IS A WELL DOCUMENTED COMMON PREMATURE FAILURE. *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
Service Brakes, Hydraulic complaints
222 reportsTL*THE CONTACT OWNS A 1999 CHEVROLET SILVERADO 1500. THERE WAS A RECALL ISSUED ON THE BRAKING SYSTEM, WHICH INCLUDED THE RIMS, EMERGENCY BRAKES, AND ROTORS. THE ABS LIGHT ILLUMINATED WHEN THE VEHICLE WAS STARTED, BUT THEN DIMMED AFTER A FEW MINUTES. THE FAILURE OCCURRED FOR OVER A WEEK UNTIL THE LIGHT REMAINED COMPLETELY ILLU…
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TL*THE CONTACT OWNS A 1999 CHEVROLET SILVERADO 1500. THERE WAS A RECALL ISSUED ON THE BRAKING SYSTEM, WHICH INCLUDED THE RIMS, EMERGENCY BRAKES, AND ROTORS. THE ABS LIGHT ILLUMINATED WHEN THE VEHICLE WAS STARTED, BUT THEN DIMMED AFTER A FEW MINUTES. THE FAILURE OCCURRED FOR OVER A WEEK UNTIL THE LIGHT REMAINED COMPLETELY ILLUMINATED. THE DEALER STATED THAT THE ABS CONTROL BOX FAILED. CHEVROLET STATED THAT THE VEHICLE HAD TOO MANY MILES TO BE REPAIRED UNDER THE RECALL. THE CONTACT BELIEVES THAT IF THERE WAS A RECALL ON THE ENTIRE BRAKING SYSTEM THAT WAS REPAIRED WHEN THE VEHICLE HAD THE SAME MILEAGE, THEN THE ABS CONTROL BOX SHOULD BE REPAIRED UNDER THE RECALL AS WELL. THE FAILURE MILEAGE WAS 217,000 AND CURRENT MILEAGE WAS 224,000.
ABS CONTROLLER FAILED ON 1999 CHEVROLET SILVERADO 1500 PICKUP TRUCK. *TR
BRAKES FAILED AT LOW SPEED. *TR
MANY COMPLAINTS WITH THIS VEHICLE MAY GET LONG BUT I AM NOT SURE AS WHERE TO SEND THEM ALL.#1 WINDOW REGULATOR FAILED THREE TIMES, THE FIRST TIME I HAD TO PAY THE FULL AMOUNT TO GET IT FIXED AS THE COMPANY RECOMMENDED BY THE DEALER WENT BANKRUPT BEFORE THE WARRANTY WAS UP, I WAS NEVER CONTACTED ABOUT THIS. #2 BROKE TWO MORE, TI…
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MANY COMPLAINTS WITH THIS VEHICLE MAY GET LONG BUT I AM NOT SURE AS WHERE TO SEND THEM ALL.#1 WINDOW REGULATOR FAILED THREE TIMES, THE FIRST TIME I HAD TO PAY THE FULL AMOUNT TO GET IT FIXED AS THE COMPANY RECOMMENDED BY THE DEALER WENT BANKRUPT BEFORE THE WARRANTY WAS UP, I WAS NEVER CONTACTED ABOUT THIS. #2 BROKE TWO MORE, TIMES DEALER PICKED UP COST ON THE SECOND TIME BUT NOT ON THE THIRD TIME THE WINDOW IS TAPED UP AS THE DEALER SAID THEY WON'T FIX IT AS THE 1 YEAR WARRANTY WAS UP. ANTI LOCK SENSOR WAS ONLY CLEANED AND IS STILL ACTING UP TRUCK LURCHES AFTER STOPS. DEALER SAID THAT THEY PROBABLY WON'T DO ANYTHING AS THEY ALREADY CLEANED THE SENSORS. THE TRUCK WAS PURCHASED USED AND I DID NOT NOTICE THE BED ON THE TRUCK HAD BEEN REPAIRED. IT LOOKS LIKE IT SITS A LITTLE LOWER NOW ON ONE SIDE THE SERVICE REP SAID THERE WERE SPOT WELDS WHERE THERE SHOULDN'T BE BUT WOULDN'T COMMENT BEYOND THAT. *TR
1999 CHEVY K-1500 LS WITH CORROSION BETWEEN THE FRONT HUB BEARING ASSEMBLY AND THE WHEEL SPEED SENSOR. CONSUMER STATES THAT THE CORROSION IS CAUSING HER BRAKES TO NOT STOP THE VEHICLE IF PRESSED UNDER 10 MPH. SHE WOULD LIKE THIS PROBLEM TAKEN CARE OF. *KB
MY 1999 CHEVY C/K PICKUP FAILS TO STOP QUICKLY WHEN TRAVELING AT LOW SPEEDS. THE ABS TURNS ON PREVENTING THE VEHICLE FROM STOPPING AS YOU APPLY EXTREME PRESSURE TO THE BRAKE PEDAL. I AM TOLD BY TWO SEPARATE MECHANICS THAT THIS IS A COMMON PROBLEM ON SIMILAR MODELS WHICH HAVE BEEN RECALLED (NHTSA CAMPAIGN # 05V379000) WHEN CO…
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MY 1999 CHEVY C/K PICKUP FAILS TO STOP QUICKLY WHEN TRAVELING AT LOW SPEEDS. THE ABS TURNS ON PREVENTING THE VEHICLE FROM STOPPING AS YOU APPLY EXTREME PRESSURE TO THE BRAKE PEDAL. I AM TOLD BY TWO SEPARATE MECHANICS THAT THIS IS A COMMON PROBLEM ON SIMILAR MODELS WHICH HAVE BEEN RECALLED (NHTSA CAMPAIGN # 05V379000) WHEN CONTACTING CHEVROLET THEY SAY THEIR IS NOTHING THEY CAN DO AS THE RECALL DOES NOT INCLUDE MY VEHICLE BY VIN NUMBER EVEN IF IT IS THE SAME PART WITH THE PROBLEM. *TR
I HAVE A 1999 CHEVROLET SILVERADO AND MY ABS LIGHT AND PARKING BRAKE LIGHT HAS CAME ON RECENTLY. THE BRAKING ON MY TRUCK IS NOT VERY GOOD IN WET CONDITIONS. I FOUND THAT IT IS A COMMON PROBLEM ON CHEVY TRUCKS, AND I WAS TOLD THAT I SHOULD JUST REMOVE THE FUSE. I WAS TOLD IT HAS SOMETHING TO DO WITH THE WHEEL HUB ASSEMBLY, AND I…
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I HAVE A 1999 CHEVROLET SILVERADO AND MY ABS LIGHT AND PARKING BRAKE LIGHT HAS CAME ON RECENTLY. THE BRAKING ON MY TRUCK IS NOT VERY GOOD IN WET CONDITIONS. I FOUND THAT IT IS A COMMON PROBLEM ON CHEVY TRUCKS, AND I WAS TOLD THAT I SHOULD JUST REMOVE THE FUSE. I WAS TOLD IT HAS SOMETHING TO DO WITH THE WHEEL HUB ASSEMBLY, AND IT IS A COSTLY FIX. I THINK FOR ONCE CHEVROLET SHOULD STEP UP AND PUT OUT A RECALL ON THIS PROBLEM. THERE IS ALSO ANOTHER COMMON COMPLAINT ABOUT MY DASH CLUSTER, WHICH I HAD ALSO FOUND IS A COMMON PROBLEM, THE ODOMETER WILL GO OFF AND ON WHEN IT FEELS LIKE, AND THE GAS GAUGE FREQUENTLY GOES UP AND DOWN, AND THE FUEL LIGHT COMES ON PERIODICALLY. THANK YOU FOR YOUR TIME. *TR
TL*THE CONTACT OWNS A 1999 CHEVROLET SILVERADO 1500. WHILE DRIVING 25 MPH, THE BRAKE PEDAL EXTENDED TO THE FLOOR WHEN DEPRESSED. THE VEHICLE COASTED TO A REPAIR SHOP. THE MECHANIC STATED THAT THE STEEL BRAKE LINE FAILED. THE CONTACT HAS THE OLD PARTS IF NEEDED. THE CURRENT AND FAILURE MILEAGES WERE 80,000. *UPDATED 12/27/0…
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TL*THE CONTACT OWNS A 1999 CHEVROLET SILVERADO 1500. WHILE DRIVING 25 MPH, THE BRAKE PEDAL EXTENDED TO THE FLOOR WHEN DEPRESSED. THE VEHICLE COASTED TO A REPAIR SHOP. THE MECHANIC STATED THAT THE STEEL BRAKE LINE FAILED. THE CONTACT HAS THE OLD PARTS IF NEEDED. THE CURRENT AND FAILURE MILEAGES WERE 80,000. *UPDATED 12/27/07 *LJ THE CONSUMER STATED FAILURE WAS ABOVE AND BELOW DRIVERS FOOT AND INVOLVED THE BRAKE LINE. UPDATED 12/12/07 *TR
BRAKE LINE RUST AT THE ANTI-LOCK CONTROLLER WITH ALL OTHER BRAKE LINES IN LIKE NEW CONDITION. *JB
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.