NHTSA owner reports · September 18, 2026 snapshot.
Service Brakes, Hydraulic complaints
78 reportsClear category filter128,615 miles · Jul 24, 2010
Service Brakes, Hydraulic
2000 GMC SIERRA 1/2 TON 4X4 TRUCK BRAKE LINE FAILURE IN MARCH 2009 A REAR BRAKE LINE FAILED DUE TO EXCESSIVE CORROSION NO ACCIDENT DUE TO FAILURE AND HAD TO HAVE THE TRUCK TOWED FOR REPAIRS. REPAIR SHOP HAD TO REPLACE RUSTED METAL LINE AND ONE REAR BRAKE CALIPER DUE TO EXCESSIVE CORROSION. 24 JULY 2010 ANOTHER BRAKE LINE RUPT…
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2000 GMC SIERRA 1/2 TON 4X4 TRUCK BRAKE LINE FAILURE IN MARCH 2009 A REAR BRAKE LINE FAILED DUE TO EXCESSIVE CORROSION NO ACCIDENT DUE TO FAILURE AND HAD TO HAVE THE TRUCK TOWED FOR REPAIRS. REPAIR SHOP HAD TO REPLACE RUSTED METAL LINE AND ONE REAR BRAKE CALIPER DUE TO EXCESSIVE CORROSION. 24 JULY 2010 ANOTHER BRAKE LINE RUPTURED DUE TO EXCESSIVE CORROSION. AGAIN TRUCK WILL BE TOWED TO REPAIR SHOP FOR BRAKE LINE REPLACEMENT/REPAIR. THIS IS THE SECOND BRAKE LINE TO RUPTURE DUE TO EXCESSIVE CORROSION AND I'VE NOTICED THE ENTIRE BRAKE LINE AND FUEL LINE SYSTEM IS SEVERELY CORRODED WITH RUST. I NO LONGER FEEL THIS TRUCK IS SAFE TO DRIVE AND WILL BE GETTING RID OF IT ASAP AFTER REPAIRS. LUCKILY THE BRAKE LINES FAILED WHILE THE TRUCK WAS PARKED IN MY DRIVEWAY. UPDATED IVOQ 09/10/10*JB *TR
NHTSA ODI #10345023
140,000 miles · Jul 21, 2010
Service Brakes, Hydraulic
DRIVING TOWARD AN INTERSECTION I APPLIED THE BRAKES. AS I PRESSED MORE FIRMLY THE PEDAL GAVE LESS RESISTANCE AND EVENTUALLY TO THE FLOORBOARD. THE VEHICLE ROLLED INTO THE INTERSECTION AND EVENTUALLY STOPPED. NOT SEEING ANY TYPE OF BRAKE WARNING ON DASH I PROCEEDED HOME SLOWLY WITH LITTLE STOPPING POWER. WHEN I INSPECTED UNDER…
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DRIVING TOWARD AN INTERSECTION I APPLIED THE BRAKES. AS I PRESSED MORE FIRMLY THE PEDAL GAVE LESS RESISTANCE AND EVENTUALLY TO THE FLOORBOARD. THE VEHICLE ROLLED INTO THE INTERSECTION AND EVENTUALLY STOPPED. NOT SEEING ANY TYPE OF BRAKE WARNING ON DASH I PROCEEDED HOME SLOWLY WITH LITTLE STOPPING POWER. WHEN I INSPECTED UNDERNEATH THE VEHICLE, I NOTICED THAT THE BRAKE LINES WERE LEAKING LIKE RUNNING WATER AND CORRODED SO SEVERELY THAT THEY NEEDED TO BE REPLACED. THE VEHICLE WAS DELIVERED TO THE NEAREST AUTO REPAIR FACILITY. *TR
NHTSA ODI #10344463
152,500 miles · Jul 10, 2010
Service Brakes, Hydraulic
SEVERE CORROSION OF THE STEEL HYDRAULIC BRAKE LINES ON 2000 GMC SIERRA 1500 2WD. SEVERE CORROSION EXISTS AT POINTS WHERE LINES ARE IN CONTACT WITH THE FRAME AND EXTREME CORROSION WHERE BODY LINE CONNECTS TO FLEX LINE AT REAR AXLE. THIS IS SAME CORROSION AS REPORTED ON OTHER VEHICLES WITH NO FACTORY REPLACEMENTS AVAILABLE FOR A…
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SEVERE CORROSION OF THE STEEL HYDRAULIC BRAKE LINES ON 2000 GMC SIERRA 1500 2WD. SEVERE CORROSION EXISTS AT POINTS WHERE LINES ARE IN CONTACT WITH THE FRAME AND EXTREME CORROSION WHERE BODY LINE CONNECTS TO FLEX LINE AT REAR AXLE. THIS IS SAME CORROSION AS REPORTED ON OTHER VEHICLES WITH NO FACTORY REPLACEMENTS AVAILABLE FOR AFFECTED PARTS. *TR
NHTSA ODI #10342454
200,000 miles · May 26, 2010
Service Brakes, Hydraulic
ALL OF THE BRAKE LINES ON MY 2000 GMC SIERRA 1500 ARE RUSTING THRU AND BURSTING. CAUSING LOSS OF BRAKES AND NEARLY CAUSING AN ACCIDENT. *TR
NHTSA ODI #10332282
112,000 miles · May 19, 2010
Service Brakes, Hydraulic
TL* THE CONTACT OWNS A 2000 GMC SIERRA 1500. WHILE SERVICING THE BRAKES, THE CONTACT NOTICED THAT THE BRAKE PADS ARE RUBBING AGAINST THE INSIDE OF THE ROTORS ON ALL FOUR WHEELS. THE VEHICLE HAD NOT BEEN DIAGNOSED AT THE TIME OF THE COMPLAINT. THE CURRENT AND FAILURE MILEAGE WAS APPROXIMATELY 112,000.
NHTSA ODI #10331139
148,976 miles · Apr 25, 2010
Service Brakes, Hydraulic
APPROACHING STOP SIGN AT AN INTERSECTION APPLIED BRAKE PEDAL AND AT SAME TIME PEDAL WENT DOWN ALMOST TO FLOOR AND LOST OF BRAKING FORCE. WAS ABLE TO BRING VEHICLE TO A STOP BUT HAD NO ROOM TO SPARE. INSPECTION UNDER VEHICLE REVEALED BRAKE LINE RUPTURED DUE TO CORROSION. VEHICLE HAS BEEN PARKED SINCE THAT TIME AND NOT IN USE. BRA…
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APPROACHING STOP SIGN AT AN INTERSECTION APPLIED BRAKE PEDAL AND AT SAME TIME PEDAL WENT DOWN ALMOST TO FLOOR AND LOST OF BRAKING FORCE. WAS ABLE TO BRING VEHICLE TO A STOP BUT HAD NO ROOM TO SPARE. INSPECTION UNDER VEHICLE REVEALED BRAKE LINE RUPTURED DUE TO CORROSION. VEHICLE HAS BEEN PARKED SINCE THAT TIME AND NOT IN USE. BRAKE LINE RUNNING TO REAR OF VEHICLE NEEDS TO BE REPLACED. *TR
NHTSA ODI #10327342
83,318 miles · Apr 19, 2010
Service Brakes, Hydraulic
TRUCK LOST ABILITY TO STOP EFFECTIVELY. TRUCK WAS TAKEN TO LOCAL REPAIR SHOP. MECHANIC FOUND BRAKE LINES HAD RUPTURED BECAUSE OF CORROSION. BRAKE LINES WERE REPLACED. *TR
NHTSA ODI #10326321
89,811 miles · Apr 19, 2010
Service Brakes, Hydraulic
TRUCK LOST ABILITY TO STOP EFFECTIVELY. TRUCK WAS TAKEN TO LOCAL REPAIR SHOP. MECHANIC FOUND STEEL BRAKE LINES HAD RUPTURED BECAUSE OF CORROSION. BRAKE LINES WERE REPLACED. *TR
NHTSA ODI #10326298
89,000 miles · Apr 16, 2010
Service Brakes, Hydraulic
TL*THE CONTACT OWNS A 2000 GMC SIERRA 1500. WHILE DRIVING APPROXIMATELY 35 MPH, THE CONTACT ATTEMPTED TO APPLY THE BRAKES TO AVOID CRASHING INTO THE VEHICLE IN FRONT OF HIM; HOWEVER, THEY FAILED TO RESPOND. THE CONTACT WAS FORCED TO MAKE A LEFT TO AVOID THE CRASH. THE FAILURE OCCURRED TWICE. THE VEHICLE WAS TAKEN TO AN AUTHORIZE…
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TL*THE CONTACT OWNS A 2000 GMC SIERRA 1500. WHILE DRIVING APPROXIMATELY 35 MPH, THE CONTACT ATTEMPTED TO APPLY THE BRAKES TO AVOID CRASHING INTO THE VEHICLE IN FRONT OF HIM; HOWEVER, THEY FAILED TO RESPOND. THE CONTACT WAS FORCED TO MAKE A LEFT TO AVOID THE CRASH. THE FAILURE OCCURRED TWICE. THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER WHERE THE BRAKE LINE WAS REPLACED AS IT WAS COVERED WITH RUST. THE CURRENT MILEAGE WAS APPROXIMATELY 93,000. THE FAILURE MILEAGE WAS APPROXIMATELY 89,000.
NHTSA ODI #10325999
63,000 miles · Apr 16, 2010
Service Brakes, Hydraulic
TL*THE CONTACT OWNS A 2000 GMC SIERRA 1500. WHILE DRIVING AT APPROXIMATELY 30 MPH, THE CONTACT NOTICED THAT THE BRAKE PEDAL WENT TO THE FLOORBOARD WHEN IT WAS DEPRESSED. THE CONTACT WAS FORCED TO ALLOW THE VEHICLE TO COAST THROUGH A STOP SIGN WHEN THE BRAKES FAILED. THE VEHICLE WAS TOWED TO AN AUTHORIZED DEALER WHERE THE BRAKE L…
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TL*THE CONTACT OWNS A 2000 GMC SIERRA 1500. WHILE DRIVING AT APPROXIMATELY 30 MPH, THE CONTACT NOTICED THAT THE BRAKE PEDAL WENT TO THE FLOORBOARD WHEN IT WAS DEPRESSED. THE CONTACT WAS FORCED TO ALLOW THE VEHICLE TO COAST THROUGH A STOP SIGN WHEN THE BRAKES FAILED. THE VEHICLE WAS TOWED TO AN AUTHORIZED DEALER WHERE THE BRAKE LINE WAS REPLACED. THE CONTACT HAD NOT CALLED THE MANUFACTURER WHEN THE COMPLAINT WAS FILED. THE FAILURE MILEAGE WAS APPROXIMATELY 63,000. THE CURRENT MILEAGE WAS APPROXIMATELY 67,000.
NHTSA ODI #10325981
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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