NHTSA owner reports · September 18, 2026 snapshot.
What owners actually said
614 reports14,200 miles · Sep 1, 2015
Service Brakes
@00 MILES AFTER COMPLETE BRAKE JOB NEW PADS AND ROTORS STATE INSPECTION STEEL BRAKE LINE FROM ABS UNIT TO RF CALIBER FAILED. THREE DAYS LATER STEEL LINE FROM ABS TO MASTER AND FRONT BRAKES FAILED. THIS SHOULD BE A MANDATORY RECALL PEOPLE WILL BE KILLED. WHY ARE OTHER MANUFACTURES HAVING THIS PROBLEM? HIGHER QUALITY MATERIAL…
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@00 MILES AFTER COMPLETE BRAKE JOB NEW PADS AND ROTORS STATE INSPECTION STEEL BRAKE LINE FROM ABS UNIT TO RF CALIBER FAILED. THREE DAYS LATER STEEL LINE FROM ABS TO MASTER AND FRONT BRAKES FAILED. THIS SHOULD BE A MANDATORY RECALL PEOPLE WILL BE KILLED. WHY ARE OTHER MANUFACTURES HAVING THIS PROBLEM? HIGHER QUALITY MATERIAL MAYBE. THE PROBLEM IS SO COMMON GM HAS DEVELOPED A KIT WITH ALL NEW BRAKE LINES. INSTALLATION IS ON YOU PRICES RANGE FROM 1000-4000 DOLLARS TO CORRECT THE PROBLEM. (NOTE BETTER QUALITY BRAKE LINES ARE USED IN THE KIT.)
NHTSA ODI #10760843
Mileage unknown · Aug 25, 2015
Electrical SystemEngineFuel/propulsion SystemCrashFire
FATAL COLLISION OCCURRED ON 8/20/15 ON SR 126E IN LANE COUNTY, OREGON. VEHICLE DRIFTED OFF ROADWAY AND SUSTAINED FRONTAL IMPACT WITH LARGE TREE RESULTING IN ENGINE FIRE. THIS IS THE THIRD OF THREE CHEV SILVERADOS THAT HAVE BEEN INVOLVED IN FRONTAL IMPACTS THIS YEAR THAT HAS RESULTED IN A FIRE
NHTSA ODI #10759192
147,000 miles · Aug 20, 2015
Service Brakes
TL* THE CONTACT OWNS A 2000 CHEVROLET SILVERADO 1500. THE CONTACT NOTICED SEVERE CORROSION NEAR THE ABS CONTROL BOX ON A BRAKE LINE, WHICH RESULTED IN EXCESS FLUID LEAKING FROM THE BRAKE LINE. THE CONTACT MENTIONED THAT THE BRAKES FAILED TO RESPOND AND THE BRAKE WARNING INDICATOR ILLUMINATED. THE VEHICLE WAS NOT REPAIRED. THE MA…
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TL* THE CONTACT OWNS A 2000 CHEVROLET SILVERADO 1500. THE CONTACT NOTICED SEVERE CORROSION NEAR THE ABS CONTROL BOX ON A BRAKE LINE, WHICH RESULTED IN EXCESS FLUID LEAKING FROM THE BRAKE LINE. THE CONTACT MENTIONED THAT THE BRAKES FAILED TO RESPOND AND THE BRAKE WARNING INDICATOR ILLUMINATED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 147,000. MA 10/14 *CN
NHTSA ODI #10749981
173,526 miles · Aug 9, 2015
Service BrakesVehicle Speed Control
MY ANTI-LOCK BRAKES WOULD KICK IN WHEN I WOULD SLOW DOWN ALMOST TO A STOP. THEY WOULD NOT LET ME STOP. NO WARNING LIGHTS WERE ON AND MY BRAKE SYSTEM HAS BEEN WORKING GREAT. IS THERE A RECALL ON THIS PROBLEM, SEEMS TO HAPPEN TO A LOT OF CHEVY OWNERS?
NHTSA ODI #10747310
130,500 miles · Jul 6, 2015
Service Brakes
I WAS DRIVING UP MY STREET TO GO WATCH FIREWORKS AND WHEN I WENT TO STOP AT THE STOP SIGN, MY BRAKE PEDAL SUNK TO THE FLOOR. I BARELY MANAGED TO STOP IN TIME AND GOT TURNED AROUND TO GET MY 2000 CHEVY SILVERADO BACK IN MY DRIVEWAY. WHEN I LOOKED FOR THE PROBLEM I SAW RUSTED BRAKE LINES, AND BRAKE FLUID DRIPPING FROM THEM. *TR
NHTSA ODI #10732095
93,000 miles · Jun 11, 2015
Tires
TL* THE CONTACT OWNS A 2000 CHEVROLET SILVERADO 1500 EQUIPPED WITH GENERAL AMERI 660 AS TIRES (NA), SIZE: P255/70R16 (NA). WHILE DRIVING APPROXIMATELY 50 MPH, THERE WAS A LOUD THUMP SOUND NEAR THE REAR DRIVER SIDE TIRE AND THE CONTACT LOST CONTROL OF THE REAR OF THE VEHICLE. THE CONTACT PULLED OVER AND OBSERVED THAT THE TREAD SE…
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TL* THE CONTACT OWNS A 2000 CHEVROLET SILVERADO 1500 EQUIPPED WITH GENERAL AMERI 660 AS TIRES (NA), SIZE: P255/70R16 (NA). WHILE DRIVING APPROXIMATELY 50 MPH, THERE WAS A LOUD THUMP SOUND NEAR THE REAR DRIVER SIDE TIRE AND THE CONTACT LOST CONTROL OF THE REAR OF THE VEHICLE. THE CONTACT PULLED OVER AND OBSERVED THAT THE TREAD SEPARATED FROM THE REAR DRIVER SIDE TIRE. THE VEHICLE WAS TAKEN TO AN INDEPENDENT DEALER WHERE IT WAS DIAGNOSED THAT THE TREAD SEPARATED. THE TIRE WAS NOT REPLACED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE VEHICLE FAILURE MILEAGE WAS APPROXIMATELY 93,000 AND THE TIRE FAILURE MILEAGE WAS 15,000.
NHTSA ODI #10724683
250,000 miles · Jun 2, 2015
Service Brakes
BRAKE LINES ROTTED OUT DO TO ROAD SALT.
NHTSA ODI #10722843
93,465 miles · Apr 5, 2015
Service Brakes
BACKED OUT OF GARAGE DRIVE WITH A DOWNWARD SLOPE. THE BRAKE PEDAL WENT TO THE FLOOR. STOPPED THE TRUCK USING THE EMERGENCY BRAKE. THE BRAKE LIGHT CAME ON AFTER THE INCIDENT, NOT BEFORE. CHECKED THE BRAKE FLUID RESERVOIR, FLUID LEVEL WAS BELOW MINIMUM. UNDER THE VEHICLE, THE PROBLEM WAS APPARENT. NEAR THE ABS CONTROL UNIT…
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BACKED OUT OF GARAGE DRIVE WITH A DOWNWARD SLOPE. THE BRAKE PEDAL WENT TO THE FLOOR. STOPPED THE TRUCK USING THE EMERGENCY BRAKE. THE BRAKE LIGHT CAME ON AFTER THE INCIDENT, NOT BEFORE. CHECKED THE BRAKE FLUID RESERVOIR, FLUID LEVEL WAS BELOW MINIMUM. UNDER THE VEHICLE, THE PROBLEM WAS APPARENT. NEAR THE ABS CONTROL UNIT IT LOOKED LIKE THE METAL LINE(S) HAD EXPLODED AND BRAKE FLUID WAS ALL OVER THE UNDERSIDE OF THE TRUCK AND DRIPPING DOWN THE FRAME RAIL. CHECKING THE VEHICLE, I FOUND ALL THE METAL BRAKE LINES, ESPECIALLY NEAR THE ABS UNIT, WERE BADLY RUSTED. TWO PROBLEMS: 1. THE FAILURE WAS CATASTROPHIC WITHOUT WARNING. WHILE THE BRAKE LIGHT CAME ON AFTER THE BRAKE LINE FAILURE, IT PROVIDED NO PRIOR INDICATION OF PROBLEMS. BRAKE FLUID WAS OK PRIOR TO THE LINE FAILURE (NO BRAKE SERVICE LIGHT) AND THE BRAKE FLUID LOSS WAS THE RESULT OF THE BRAKE LINE RUPTURE. THE BRAKE LINE, WEAKENED BY RUST, FAILED WITH THE INCREASED PRESSURE WHEN BRAKES WERE APPLIED. 2. THERE WAS NO RESIDUAL OR BACK-UP BRAKING AVAILABLE EVEN WITH FULLY DEPRESSED BRAKE PEDAL. I'VE READ GM'S STATEMENT THAT THE BRAKE SERVICE LIGHT WOULD PROVIDE ADVANCE WARNING AND THE BRAKING SYSTEM IS DESIGNED TO PROVIDE BRAKING (WITH LONGER STOPPING DISTANCES) SHOULD THERE BE FAILURES IN THE SYSTEM. UNFORTUNATELY, IN CATASTROPHIC BRAKE LINE FAILURES THERE WERE NO WARNINGS; THE WARNING LIGHT WAS DELAYED AFTER THE FACT. FROM AN ENGINEER'S PERSPECTIVE, DID THE METALLURGICAL CONTENT OF THE BRAKE LINES CHANGE IN 1999 OR PERHAPS THAT WAS WHEN THE ABS HOUSING CHANGED TO ALUMINUM? THE GALVANIC NATURE OF THE STEEL BRAKE LINES CONNECTING TO ALUMINUM IN THE PRESENCE OF SALT WATER WILL CERTAINLY RESULT IN THE INCREASED CORROSION OF THE BRAKE LINES. SUMMARY: THE NHTSA NEEDS TO ISSUE A RECALL (REGARDLESS WHETHER GM IS HELD RESPONSIBLE FOR THE MONETARY COSTS OF REPAIR) TO PREVENT ACCIDENTS. *TR
NHTSA ODI #10703818
168,267 miles · Apr 3, 2015
Electrical SystemEngine
DRIVING AT APPROXIMATELY 30 MPH, STARTED TO MAKE RIGHT TURN AND ENGINE SUDDENLY SHUT OFF AND JUST AS QUICKLY KICK STARTED. LATER SAME DAY ENGINE SHUT OFF IN PARKING LOT, BUT I WAS ABLE TO IMMEDIATELY RESTART IT. THE NEXT DAY ENGINE DID THE SAME THING (SHUT OFF) BUT AGAIN, I WAS ABLE TO IMMEDIATELY RESTART IT. *TR
NHTSA ODI #10703545
118,560 miles · Mar 8, 2015
Fuel/propulsion System
FUEL TANK LEAK ,FRONT OF TANK APPROX HALF WAY UP TANK NOT VISABLE WITH OUT REMOVAL BRAKE LINES ALSO ROTTED OUT FOR SECOND TIME. *TR
NHTSA ODI #10692867
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.
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