IllustrationBACKING OUT OF MY DRIVEWAY THE BRAKE PEDAL WENT TO THE FLOOR, THE REAR BRAKE LINES RUSTED THROUGH. TO DO THE REPAIR THE REAR CALIPERS NEEDED TO BE REPLACED BECAUSE THE BOTH THE BLEEDERS AND LINE CONNECTIONS WERE SEIZED. FLASH FORWARD ONE YEAR AND NOW THE FRONT LINES FRONT HOSES AND FRONT CALIPERS NEED THE SAME THING. *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 complaints
126 reportsWHEN STOPPING AT STOP SIGN PEDAL WENT ALMOST ALL WAY TO THE FLOOR. CYCLES PEDAL A FEW TIMES AFTERTHOUGHT COMING TO A COMPLETE STOP. STILL WENT TO FLOOR AND HEARD AROUND LIKE AIR OR WATER RUSHING AT EACH PUSH OF THE BRAKE PEDAL. UPON INVESTIGATION FOUND LEAK ON TOP SIDE OF MAIN BRAKE LINE SPRAYING BRAKE FLUID IN UPWARD DIRECTION …
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WHEN STOPPING AT STOP SIGN PEDAL WENT ALMOST ALL WAY TO THE FLOOR. CYCLES PEDAL A FEW TIMES AFTERTHOUGHT COMING TO A COMPLETE STOP. STILL WENT TO FLOOR AND HEARD AROUND LIKE AIR OR WATER RUSHING AT EACH PUSH OF THE BRAKE PEDAL. UPON INVESTIGATION FOUND LEAK ON TOP SIDE OF MAIN BRAKE LINE SPRAYING BRAKE FLUID IN UPWARD DIRECTION INTO REAR DRIVERSIDE CAB FLOOR. BRAKELINE APPEARS TO BE PITTED WITH CORROSION WITH LARGE HOLE. I DO NOT LIVE IN A SALT AIR ENVIRONMENT. *TR
PUT BRAKES ON AND PEDAL WENT TO FLOOR, FINALLY GOT TRUCK STOPPED AND BRAKE FLUID WAS POURING FROM UNDER CAB. THE BRAKE LINES ARE BADLY RUSTED. *TR
I COULD HAVE BEEN KILLED, AS WELL AS THE POLICE OFFICER I ALMOST HIT AT THE STOPLIGHT AND THE PEOPLE IN CROSS TRAFFIC I WOULD HAVE PUSHED HIM INTO, WHEN MY BRAKES FAILED DUE TO RUSTED OUT BRAKE LINES. NO WARNING LIGHTS TO TELL ME THERE WAS A PROBLEM AND STILL NO WARNING LIGHT, EVEN THOUGH I HAVE NO BRAKES. THE ONLY REASON I WAS …
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I COULD HAVE BEEN KILLED, AS WELL AS THE POLICE OFFICER I ALMOST HIT AT THE STOPLIGHT AND THE PEOPLE IN CROSS TRAFFIC I WOULD HAVE PUSHED HIM INTO, WHEN MY BRAKES FAILED DUE TO RUSTED OUT BRAKE LINES. NO WARNING LIGHTS TO TELL ME THERE WAS A PROBLEM AND STILL NO WARNING LIGHT, EVEN THOUGH I HAVE NO BRAKES. THE ONLY REASON I WAS ABLE TO STOP IS BECAUSE I WAS NOT GOING THE FULL SPEED LIMIT DUE TO GROCERIES STACKED ON THE SEAT BESIDE ME; WITH DOWNSHIFTING TO LOW RANGE ONE AND PUMPING THE BRAKES REPEATEDLY TO GAIN MAYBE 5 TO 10% PRESSURE, I ONLY STOPPED ABOUT 5 TO 10 FEET BEHIND THE OFFICER. ADD ANOTHER 10-15 MPH AND IT WOULD HAVE BEEN IMPOSSIBLE TO STOP. AN AVERAGE DRIVER WOULD HAVE MOST LIKELY WRECKED AT FULL SPEED. THE LINE BURST ON THE DRIVER'S SIDE, UNDER WHERE THE DOOR JAM STARTS. ALL THE BRAKE LINES ARE RUSTED. I'VE HAD TWO 1971 CHEVY TRUCKS AND A 1964 PLYMOUTH VALIANT CONVERTIBLE AND NOT A SINGLE ONE OF THEM EVER HAD A BRAKE LINE PROBLEM. THIS TRUCK IS ONLY 13 YEARS OLD, VERY WELL TAKEN CARE OF, STILL LOOKS NEW, REGULARLY COMPLIMENTED ON ITS CONDITION AND LOOKS AND IT ALMOST KILLED PEOPLE! *TR
ON OCT. 10 2012, A CAR STOP REAL FAST IN FRONT OF ME AND I HAD TO APPLY MY BRAKES. THEY DID NOT WORK, WENT A AROUND HER AND STILL COULD NOT STOP. WENT THROUGH RED LIGHT,DODGING TRAFFIC. IF I DIDN'T KNOW HOW TO HANDLE MY TRUCK I WOULD HAVE HIT 6 DIFFERENT CARS. I MADE IT THROUGH THAT, WENT INTO PARKING LOT STILL COULD NOT STOP. …
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ON OCT. 10 2012, A CAR STOP REAL FAST IN FRONT OF ME AND I HAD TO APPLY MY BRAKES. THEY DID NOT WORK, WENT A AROUND HER AND STILL COULD NOT STOP. WENT THROUGH RED LIGHT,DODGING TRAFFIC. IF I DIDN'T KNOW HOW TO HANDLE MY TRUCK I WOULD HAVE HIT 6 DIFFERENT CARS. I MADE IT THROUGH THAT, WENT INTO PARKING LOT STILL COULD NOT STOP. I WAS HEAD FOR A BUSINESS AND IF I DID NOT TURN THE WHEEL WHEN I DID I WOULD HAVE GONE RIGHT INTO IT. I HIT A TREE SO I COULD STOP. UPON CHECKING THE BRAKE LINES WE FOUND OUT THAT THEY WE RUSTED THROUGH. NOT ONLY ARE THE BRAKE LINES BUT THE FUEL LINES ARE ALSO LIKE THIS. I LOVE THE TRUCK BUT GM SHOULD DO SOMETHING ABOUT THIS. IF I DIDN'T KNOW HOW THO DRIVE THERE WOULD HAVE BEEN SEVERAL PEOPLE KILLED THAT DAY, THANK GOD I HAD SOMEONE WATCHING OVER ME ON THAT DAY. *TR
REAR BRAKE LINE CORRODED AND CAUSED A BREAK WHERE BRAKE FLUID SPRAYED THROUGH THE LINE WHEN THE BRAKES WERE APPLIED. LOSS OF BRAKING DISTANCE. NO ACCIDENT. *TR
THANKFULLY AFTER REMOVING MY BOX OF MY TRUCK TO REPAIR RUST, I NOTICED SEVERE CORROSION/RUST ON THE BRAKE LINE THAT FEEDS THE REAR CALIPERS (ENOUGH CORROSION WHERE IT WAS BOWING OUT AND SLIGHTLY LEAKING). I WENT OUT AND PURCHASED CORROSION PROOF FLEX LINE AND REPLACED THE ENTIRE LINE. UPON FURTHER INSPECTION THE ENTIRE LINE IS B…
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THANKFULLY AFTER REMOVING MY BOX OF MY TRUCK TO REPAIR RUST, I NOTICED SEVERE CORROSION/RUST ON THE BRAKE LINE THAT FEEDS THE REAR CALIPERS (ENOUGH CORROSION WHERE IT WAS BOWING OUT AND SLIGHTLY LEAKING). I WENT OUT AND PURCHASED CORROSION PROOF FLEX LINE AND REPLACED THE ENTIRE LINE. UPON FURTHER INSPECTION THE ENTIRE LINE IS BASICALLY CORRODED AWAY. I STARTED LOOKING AT THE OTHER LINES AND THEY ALL HAVE THIS SAME PROBLEM I REALLY CAN'T AFFORD TO REPLACE THEM ALL NOR DO I HAVE THE TIME, READING ONLINE I'M NOT THE ONLY ONE. THIS SHOULD BE INVESTIGATED, THIS IS PUTTING MANY LIVES AT RISK! PLEASE INVESTIGATE THIS. GM NEEDS TO BE HELD FOR THIS PROBLEM. *TR
REAR BRAKE LINE BURST. UPON INSPECTION FOUND THAT ALL BRAKE LINES ARE SEVERELY CORRODED. *TR
COMING HOME FROM VERMONT AND 6 MILES A WAY ABS LIGHT CAME ON,CAME TO A STOP SIGN AND BRAKE PEDDLE WENT TO FLOOR I WAS PULLING A U-HAUL TRAILER,GOT TO WHERE I WAS GOING AND LOOKED UNDER AND SAW BRAKE LINE WAS RUSTED, NICE SIZE HOLE. *TR
WAS MOVING THE TRUCK INTO GARAGE TO CHANGE OIL.. HIT BRAKES AND PEDAL DROPPED A BIT, BRAKE FLUID FROM RUSTED OUT LINE JUST BELOW DRIVERS FLOORBOARD. I'VE HEARD THERE WAS AN ISSUE WITH THESE...THIS IS NOT THE FIRST LINE TO GO..THIS IS A BAD DESIGN. I LIVE IN NORTHERN INDIANA...PART OF THE SALT BELT. *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.