Illustration1999 CHEVY SILVERADO P/U HAD RUSTY BRAKE LINES CAUSING TOTAL BRAKE FAILURE. SPENT OVER $5000 AT DEALER TO CORRECT PROBLEM. ALL HYDRAULIC LINES HAD TO BE REPLACED. GM REFUSED TO REIMBURSE ME FOR ANY OF THE REPAIRS OR REPAIR BRAKES TO MY SATISFACTION. *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 reportsI HAVE 99 CHEVROLET SILVERADO 1500 LS 2WD WITH 6-WAY POWER SEATS. BOTH THE PASSENGER AND DRIVER SEATS MOVE FRONT AND BACK DURING BRAKING OR ACCELERATION. THE MOVEMENT IS AS MUCH AS 1 INCH. THE MOVEMENT HAS INCREASINGLY BECOME MORE SINCE I FIRST NOTICED THE PROBLEM IN 2006. I AM VERY CONCERNED THAT THIS PROBLEM POSES A SAFETY …
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I HAVE 99 CHEVROLET SILVERADO 1500 LS 2WD WITH 6-WAY POWER SEATS. BOTH THE PASSENGER AND DRIVER SEATS MOVE FRONT AND BACK DURING BRAKING OR ACCELERATION. THE MOVEMENT IS AS MUCH AS 1 INCH. THE MOVEMENT HAS INCREASINGLY BECOME MORE SINCE I FIRST NOTICED THE PROBLEM IN 2006. I AM VERY CONCERNED THAT THIS PROBLEM POSES A SAFETY RISK IN A PANIC STOP OR COLLISION SITUATION. THE SEAT(S) MAY BREAK LOOSE AND SLIDE FULL FORWARD AND/OR BACKWARD RESULTING IN LOSS OF CONTROL OR BRAKING RESULTING IN INJURY OR DEATH, AND PROPERTY DAMAGE. AIRBAG SAFEGUARD WOULD BE RENDERED USELESS BECAUSE THE SEAT MOVES IN A UNPREDICTABLE WAY THAT WAS NEVER ANALYZED BY MANUFACTURER'S TESTING. *TR
EXHAUST MANIFOLD BOLTS BREAKING OFF. *TR
1999-20?? GM 5.3 LITER ENGINE. LEFT SIDE EXHAUST MANIFOLD, LAST BOLT BACK HEAD HAS POPPED OFF. I HAVE SEEN FOUR OTHER MOTORS LIKE THIS AND HAVE HEARD OF SEVERAL MORE. THIS ALLOWS EXHAUST GASES TO ENTER THE CABIN AREA POSING A RISK OF CO POISONING. *TR
I HAVE A 1999 CHEVY SILVERADO WHICH RECENTLY CAUGHT ON FIRE 20 MINUTES AFTER I GOT TO WORK ON WEDNESDAY MORNING. THE VEHICLE IS A TOTAL LOSS. THE FIRE STARTED ON THE DRIVERS SIDE IN THE ENGINE COMPARTMENT. *TR
I OWN A 1999 SILVERADO EXTENDED CAB 2WD LS PICKUP TRUCK. I NEARLY RAN THROUGH MY PARENTS GARAGE WHEN THE BRAKE LINE SUDDENLY RUPTURED AND LEAKED. UPON FURTHER INVESTIGATION ALL THE LINES ARE TERRIBLY CORRODED AND RUSTED TO A POINT OF BEING BRITTLE( EVEN LINES UNDER THE HOOD WHERE THEY ARE TYPICALLY PROTECTED) I WAS HAPPY THA…
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I OWN A 1999 SILVERADO EXTENDED CAB 2WD LS PICKUP TRUCK. I NEARLY RAN THROUGH MY PARENTS GARAGE WHEN THE BRAKE LINE SUDDENLY RUPTURED AND LEAKED. UPON FURTHER INVESTIGATION ALL THE LINES ARE TERRIBLY CORRODED AND RUSTED TO A POINT OF BEING BRITTLE( EVEN LINES UNDER THE HOOD WHERE THEY ARE TYPICALLY PROTECTED) I WAS HAPPY THAT I WAS NOT ON THE HIGHWAY WHEN THIS OCCURRED. I HAVE SINCE CHANGED THE MAIN LINE TO THE REAR OF THE TRUCK WITH A BETTER QUALITY LINE AND AM WAITING TO DO THE BALANCE BUT AM UNEASY AND WILL PROBABLY HAVE TO JUST DO THEM. THIS TRUCK ALSO HAD RUSTY TRANSMISSION LINES THAT CAUSED TRANSMISSION FAILURE SINCE I DID NOT CATCH IT IN TIME WHEN THE LINE ROTTED OUT. WHAT IS GOING ON WHEN A COMPANY CANT PUT QUALITY MATERIALS IN A SYSTEM CRITICAL PART? THE REAR PLATES THAT SHIELD THE PARKING BRAKE COMPLETERUSTED AND FELL OFF. *TR
I OWN A 1999 CHEVY SILVERADO. I WAS GOING AROUND A BLIND DOWN HILL TURN, WHEN I GOT AROUND THE TURN THERE WAS A CAR COMPLETELY ON MY SIDE OF THE ROAD. I SLAMMED ON THE BRAKES, THE TRUCK SLOWED BUT DID NOT STOP, AND THE BRAKE PEDAL WENT TO THE FLOOR. AFTER I WAS ABLE TO STOP THE TRUCK, I FOUND THAT THE STEEL BRAKE LINE RUNNING AL…
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I OWN A 1999 CHEVY SILVERADO. I WAS GOING AROUND A BLIND DOWN HILL TURN, WHEN I GOT AROUND THE TURN THERE WAS A CAR COMPLETELY ON MY SIDE OF THE ROAD. I SLAMMED ON THE BRAKES, THE TRUCK SLOWED BUT DID NOT STOP, AND THE BRAKE PEDAL WENT TO THE FLOOR. AFTER I WAS ABLE TO STOP THE TRUCK, I FOUND THAT THE STEEL BRAKE LINE RUNNING ALONG THE FRAME HAD RUPTURED. THE LOCATION OF THE RUPTURE WAS UNDER THE DRIVERS SIDE DOOR. I TOOK THE TRUCK TO MY LOCAL CHEVY DEALER AND HAD THE LINE REPLACED. *TR
TL*THE CONTACT OWNS A 1999 CHEVROLET SILVERADO 1500. WHILE DRIVING AND HAULING A TRAILER AT APPROXIMATELY 35 MPH, THE CONTACT DEPRESSED THE BRAKE PEDAL BUT THE BRAKES DID NOT ENGAGE SO THE VEHICLE WENT THROUGH A RED TRAFFIC LIGHT. THE CONTACT NOTICED THE BRAKE LINE SEEMED COMPLETELY RUSTED. THE VEHICLE HAD NOT BEEN REPAIRED AT T…
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TL*THE CONTACT OWNS A 1999 CHEVROLET SILVERADO 1500. WHILE DRIVING AND HAULING A TRAILER AT APPROXIMATELY 35 MPH, THE CONTACT DEPRESSED THE BRAKE PEDAL BUT THE BRAKES DID NOT ENGAGE SO THE VEHICLE WENT THROUGH A RED TRAFFIC LIGHT. THE CONTACT NOTICED THE BRAKE LINE SEEMED COMPLETELY RUSTED. THE VEHICLE HAD NOT BEEN REPAIRED AT THE TIME OF THE COMPLAINT. THE CURRENT AND FAILURE MILEAGES WERE APPROXIMATELY 140,000.
THE BRAKES FAILED ON MY 1999 CHEVROLET SILVERADO RECENTLY. A MECHANIC REPLACED ALL BRAKE LINES DUE TO CORROSION. *TR
MY 1999 CHEVY SILVERADO 1500 4WD (PURCHASED NEW BY ME) HAS HAD MULTIPLE CORROSION/RUST BRAKE LINE FAILURES THAT FIRST BEGAN WHEN THE VEHICLE WAS ONLY THREE YEARS OLD. ONE EVENT LEFT ME DESPERATE AS THE FAILURE OCCURRED WHEN BACKING MY 8,000LB BOAT DOWN A STEEP BOAT RAMP INTO THE WATER. THE ABS MODULE ALSO FAILED TO OPERATE WHEN …
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MY 1999 CHEVY SILVERADO 1500 4WD (PURCHASED NEW BY ME) HAS HAD MULTIPLE CORROSION/RUST BRAKE LINE FAILURES THAT FIRST BEGAN WHEN THE VEHICLE WAS ONLY THREE YEARS OLD. ONE EVENT LEFT ME DESPERATE AS THE FAILURE OCCURRED WHEN BACKING MY 8,000LB BOAT DOWN A STEEP BOAT RAMP INTO THE WATER. THE ABS MODULE ALSO FAILED TO OPERATE WHEN ONLY TWO YEARS OLD. ALL OF THIS HAS LED TO EXTREMELY EXPENSIVE REPAIRS AND MODIFICATIONS AT MY EXPENSE. MY TRUCK WAS NOT INCLUDED IN THE PREVIOUS RUST BELT STATES RECALL AS I LIVE IN VIRGINIA. *TR
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.