NHTSA owner reports · September 18, 2026 snapshot.
What owners actually said
509 reports103,000 miles · Dec 6, 2010
Electrical System
TL* THE CONTACT OWNS A 2002 CHEVROLET SILVERADO 1500. WHILE DRIVING APPROXIMATELY 50 MPH, THE SECURITY SYSTEM WARNING INDICATOR ILLUMINATED AND THE ENGINE STALLED. WHEN THE CONTACT RESTARTED THE ENGINE THE HEADLIGHTS AND INSTRUMENT PANEL LIGHTING BECAME DIM. THE VEHICLE WAS REPAIRED BY A CERTIFIED MECHANIC WITH THE REPLACEMENT O…
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TL* THE CONTACT OWNS A 2002 CHEVROLET SILVERADO 1500. WHILE DRIVING APPROXIMATELY 50 MPH, THE SECURITY SYSTEM WARNING INDICATOR ILLUMINATED AND THE ENGINE STALLED. WHEN THE CONTACT RESTARTED THE ENGINE THE HEADLIGHTS AND INSTRUMENT PANEL LIGHTING BECAME DIM. THE VEHICLE WAS REPAIRED BY A CERTIFIED MECHANIC WITH THE REPLACEMENT OF THE BATTERY. THE ALTERNATOR WAS DIAGNOSED AND WAS FUNCTIONING PROPERLY. THE FAILURE OCCURRED REPEATEDLY. THE CONTACT DETECTED THAT THE FAILURES WERE CONTRIBUTED TO THE BODY CONTROL MODULE. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS APPROXIMATELY 103,000.
NHTSA ODI #10369329
58,420 miles · Dec 5, 2010
Fuel System, GasolineService Brakes, Hydraulic
2002 CHEVROLET SILVERADO 1500, 4 WHEEL DRIVE Z71 OFF ROAD, 58420 MILES, WAS STOPPED WITH FOOT DEPRESSED ON BRAKE PEDAL, FELT PEDAL GO ALL THE WAY TO THE FLOOR. HAD TO ACCELERATE AND HAD NO BRAKES. BRAKE FLUID LEAK DUE TO RUSTED BRAKE LINE. AFTER FURTHER INSPECTION ALL BRAKE LINES, FUEL LINES, EHCU BRAKE LINE CONNECTION ARE ALL …
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2002 CHEVROLET SILVERADO 1500, 4 WHEEL DRIVE Z71 OFF ROAD, 58420 MILES, WAS STOPPED WITH FOOT DEPRESSED ON BRAKE PEDAL, FELT PEDAL GO ALL THE WAY TO THE FLOOR. HAD TO ACCELERATE AND HAD NO BRAKES. BRAKE FLUID LEAK DUE TO RUSTED BRAKE LINE. AFTER FURTHER INSPECTION ALL BRAKE LINES, FUEL LINES, EHCU BRAKE LINE CONNECTION ARE ALL RUSTED. BRAKE LINE IS IN THE PROCESS OF BEING REPLACED BUT AT A STAND STILL AT THE MOMENT DUE TO A LEAK AT THE EHCU CONNECTION DUE TO PITTING, THERE ISN'T A TIGHT CONNECTION. STILL IN THE PROCESS OF REPAIRS. HAVE ALL PARTS. *TR
NHTSA ODI #10369251
177,000 miles · Nov 24, 2010
Service Brakes, HydraulicSuspension
HAD SHOCKS REPLACED ON MY TRUCK TODAY AND MECHANIC INFORMED ME THAT BRAKE LINES ON MY 2002 CHEVROLET SILVERADO WERE RUSTED AND WOULD NEED TO BE REPLACED SOON FOR SAFETY REASONS. *TR
NHTSA ODI #10367804
21,538 miles · Nov 17, 2010
Service Brakes, Hydraulic
TL* THE CONTACT OWNS A 2002 CHEVROLET SILVERADO 1500. WHILE APPLYING THE BRAKES THE ANTI-LOCK BRAKE SYSTEM ACTIVATES. THIS CAUSES THE VEHICLE NOT TO STOP WHEN BRAKING. THE CONTACT TOOK THE VEHICLE TO A DEALER AND THE DEALER STATED THAT THE ISSUE IS WITH THE ANTI-LOCK BRAKES AND ONLY HAPPENS IN THE NORTH EAST OR SALT BELT ST…
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TL* THE CONTACT OWNS A 2002 CHEVROLET SILVERADO 1500. WHILE APPLYING THE BRAKES THE ANTI-LOCK BRAKE SYSTEM ACTIVATES. THIS CAUSES THE VEHICLE NOT TO STOP WHEN BRAKING. THE CONTACT TOOK THE VEHICLE TO A DEALER AND THE DEALER STATED THAT THE ISSUE IS WITH THE ANTI-LOCK BRAKES AND ONLY HAPPENS IN THE NORTH EAST OR SALT BELT STATES. THE DEALER STATED THE FRONT WHEEL SPEED SENSOR NEEDED TO BE REPLACED. THE CONTACT HAD THE FRONT WHEEL SPEED SENSOR REPLACED UNDER A RECALL THREE YEARS AGO. THE CONTACT STATED THIS IS A MAJOR SAFETY ISSUE THAT COULD CAUSE A CRASH. THE FAILURE MILEAGE WAS 21,538. THE CONSUMER BELIEVED THE PROBLEM WAS NOT PERFORMED CORRECTLY, THE FIRST TIME. UPDATED 01/20/11*JB UPDATED 01/28/11 *BF THE CONSUMER STATED WHEN THE ABS ACTIVATED, HE WAS ALMOST AT A COMPLETE STOP. UPDATED 02/04/11
NHTSA ODI #10366540
108,000 miles · Nov 10, 2010
Service Brakes, Hydraulic
TL*THE CONTACT OWNS A 2002 CHEVROLET SILVERADO 1500. THE CONTACT STATED THAT WHILE DECELERATING THE ANTI-LOCK BRAKES WOULD PULSATE, MAKING IT DIFFICULT TO STOP THE VEHICLE. THE DEALER WAS CONTACTED AND INFORMED HIM THAT THEY REPAIRED NHTSA CAMPAIGN RECALL, 05V379000, SERVICE BRAKES, HYDRAULIC ANTILOCK ONCE BEFORE AND THEY WERE U…
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TL*THE CONTACT OWNS A 2002 CHEVROLET SILVERADO 1500. THE CONTACT STATED THAT WHILE DECELERATING THE ANTI-LOCK BRAKES WOULD PULSATE, MAKING IT DIFFICULT TO STOP THE VEHICLE. THE DEALER WAS CONTACTED AND INFORMED HIM THAT THEY REPAIRED NHTSA CAMPAIGN RECALL, 05V379000, SERVICE BRAKES, HYDRAULIC ANTILOCK ONCE BEFORE AND THEY WERE UNABLE TO REPAIR IT AGAIN FOR FREE. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS APPROXIMATELY 108,000.
NHTSA ODI #10365265
18,000 miles · Nov 8, 2010
Service Brakes, Hydraulic
TL* THE CONTACT OWNS A 2002 CHEVROLET SILVERADO 1500. THE CONTACT STATED THE VEHICLE WAS TAKEN FOR STATE INSPECTION AND THE TECHNICIAN INFORMED THE CONTACT THAT THE EMERGENCY BRAKE WOULD NOT FUNCTION PROPERLY. THE FAILURE CAUSED THE REAR ROTORS TO WEAR PREMATURELY WHICH RESULTED IN THE REPLACEMENT OF THE ROTORS TWICE PRIOR TO BE…
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TL* THE CONTACT OWNS A 2002 CHEVROLET SILVERADO 1500. THE CONTACT STATED THE VEHICLE WAS TAKEN FOR STATE INSPECTION AND THE TECHNICIAN INFORMED THE CONTACT THAT THE EMERGENCY BRAKE WOULD NOT FUNCTION PROPERLY. THE FAILURE CAUSED THE REAR ROTORS TO WEAR PREMATURELY WHICH RESULTED IN THE REPLACEMENT OF THE ROTORS TWICE PRIOR TO BEING INFORMED OF THE EMERGENCY BRAKE FAILURE. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS 18,000.
NHTSA ODI #10364398
133,000 miles · Nov 5, 2010
Suspension
THE OTHER DAY I HEARD A GRINDING NOISE ON THE DRIVERS SIDE OF THE TRUCK. I KNEW IT WASN'T THE BRAKE PADS SINCE I HAD CHANGED THEM A FEW MONTHS AGO. IT TURNED OUT TO BE THE WHEEL BEARINGS. THESE ARE A SEALED SYSTEM AND NOT ABLE TO SERVICE THEM ON EITHER SIDE. THE SYSTEM HAS TO BE REPLACED. I ASKED THE PARTS STORE ABOUT THESE ,AN…
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THE OTHER DAY I HEARD A GRINDING NOISE ON THE DRIVERS SIDE OF THE TRUCK. I KNEW IT WASN'T THE BRAKE PADS SINCE I HAD CHANGED THEM A FEW MONTHS AGO. IT TURNED OUT TO BE THE WHEEL BEARINGS. THESE ARE A SEALED SYSTEM AND NOT ABLE TO SERVICE THEM ON EITHER SIDE. THE SYSTEM HAS TO BE REPLACED. I ASKED THE PARTS STORE ABOUT THESE ,AND HE SAID COMMON PROBLEM AND IF NOT FIXED , THE ROTOR AND BEARING ASSEMBLY COULD SNAP OFF AND CREATE AND ACCIDENT. I HAD A 2000 CHEVY SILVERADO 1500 THAT HAD THE SAME PROBLEM. *TR
NHTSA ODI #10364105
98,000 miles · Nov 2, 2010
Service Brakes, Hydraulic
WHILE HAVING MY 2002 CHEVY SILVERADO 1500 SERVICED FOR AN OIL CHANGE I WAS ADVISED THAT ALL THE STEEL BRAKE LINES WERE BADLY RUSTED, UNSAFE, AND NEEDED IMMEDIATE REPLACEMENT. INITIAL ESTIMATES ARE $2000. VEHICLE MILEAGE IS 98,000. *TR
NHTSA ODI #10363787
80,166 miles · Oct 18, 2010
Service Brakes, Hydraulic
RED BRAKE DASH LIGHT TURNED ON. INSPECTED VEHICLE AND FOUND BRAKE LINES RUSTED THROUGH AND LEAKING FLUID. *TR
NHTSA ODI #10361094
50,000 miles · Sep 14, 2010
Service Brakes, Hydraulic
2002 SILVERADO PU, BRAKING DISTANCE IS EXTENDED. SPONGY BRAKES. ONCE WHEN MOVING INTO PARKING SPACE BRAKES FAILED TO STOP CAR AT 5 MPH. NO DAMAGE. WHEN CARRYING MODERATE LOADS BRAKES NEVER SEEM RELIABLE. CHECKED BY LOCAL MECHANIC, SAYS OK, BUT ISSUE REMAINS. *TR
NHTSA ODI #10355651
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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