NHTSA owner reports · September 18, 2026 snapshot.
Service Brakes, Hydraulic complaints
78 reportsClear category filter115,000 miles · Sep 8, 2011
Service Brakes, Hydraulic
TL* THE CONTACT OWNS A 2000 GMC SIERRA 1500. WHILE DRIVING APPROXIMATELY 40 MPH THE CONTACT DEPRESSED THE BRAKE PEDAL AND IT DROPPED TO THE FLOORBOARD. THE CONTACT WAS ABLE TO STOP THE VEHICLE. THE VEHICLE WAS TOWED TO AN INDEPENDENT MECHANIC FOR DIAGNOSTIC TESTING. THE MECHANIC STATED THE BRAKE LINES CORRODED AND HAD TO BE REP…
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TL* THE CONTACT OWNS A 2000 GMC SIERRA 1500. WHILE DRIVING APPROXIMATELY 40 MPH THE CONTACT DEPRESSED THE BRAKE PEDAL AND IT DROPPED TO THE FLOORBOARD. THE CONTACT WAS ABLE TO STOP THE VEHICLE. THE VEHICLE WAS TOWED TO AN INDEPENDENT MECHANIC FOR DIAGNOSTIC TESTING. THE MECHANIC STATED THE BRAKE LINES CORRODED AND HAD TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE VIN WAS NOT AVAILABLE. THE APPROXIMATE FAILURE MILEAGE WAS 115,000.
NHTSA ODI #10424271
60,000 miles · Aug 29, 2011
Service Brakes, Hydraulic
TL* THE CONTACT OWNS A 2000 GMC SIERRA 1500. THE CONTACT STATED THAT WHILE PULLING OUT OF THE DRIVEWAY AT A LOW SPEED, THE BRAKES WERE APPLIED AND THE BRAKE PEDAL DEPRESSED DOWN TO THE FLOOR. THE CONTACT HAD TO USE THE EMERGENCY BRAKE TO STOP THE VEHICLE. THE VEHICLE WAS PARKED AND THE CONTACT NOTICED THAT THE BRAKE LINES WERE R…
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TL* THE CONTACT OWNS A 2000 GMC SIERRA 1500. THE CONTACT STATED THAT WHILE PULLING OUT OF THE DRIVEWAY AT A LOW SPEED, THE BRAKES WERE APPLIED AND THE BRAKE PEDAL DEPRESSED DOWN TO THE FLOOR. THE CONTACT HAD TO USE THE EMERGENCY BRAKE TO STOP THE VEHICLE. THE VEHICLE WAS PARKED AND THE CONTACT NOTICED THAT THE BRAKE LINES WERE RUSTED OUT AND LEAKING BRAKE FLUID. THE VEHICLE WAS THEN TOWED TO AN INDEPENDENT MECHANIC, WHERE THE BRAKE LINES WERE REPLACED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 60,000.
NHTSA ODI #10422466
95,000 miles · Aug 16, 2011
Service Brakes, Hydraulic
ANTI LOCK BRAKE SENSOR CORROSION CAUSES LOW SPEED BRAKING FAILURE. DRIVING AT LESS THAN 5 MPH WAS TERRIFYING. ALMOST HITTING PEDESTRIANS AT A CROSSWALK, ROLLING INTO AN INTERSECTION, AND ALMOST HITTING A STOPPED CAR IN FRONT OF ME. I TOOK THE TRUCK TO THE DEALER AND THEY VERIFIED THE CORRODED SENSORS. THIS WAS A RECALLED ISS…
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ANTI LOCK BRAKE SENSOR CORROSION CAUSES LOW SPEED BRAKING FAILURE. DRIVING AT LESS THAN 5 MPH WAS TERRIFYING. ALMOST HITTING PEDESTRIANS AT A CROSSWALK, ROLLING INTO AN INTERSECTION, AND ALMOST HITTING A STOPPED CAR IN FRONT OF ME. I TOOK THE TRUCK TO THE DEALER AND THEY VERIFIED THE CORRODED SENSORS. THIS WAS A RECALLED ISSUE ALREADY COMPLIED WITH. NO HELP FROM GM. THEY SAID THE BURDEN WAS MINE. *KB
NHTSA ODI #10419631
85,000 miles · Aug 16, 2011
Service Brakes, Hydraulic
COMPLETE BRAKE FAILURE DUE TO EXCESSIVE CORROSION. I GOT LUCKY THAT I HAD ROOM TO ROLL OUT. UPON INSPECTION I NOTICED THAT MANY COMPONENTS SHOW SIGNS OF EXCESSIVE RUST. *KB
NHTSA ODI #10419627
95,365 miles · Jul 11, 2011
Service Brakes, Hydraulic
TL* THE CONTACT OWNS A 2000 GMC SIERRA 1500. THE CONTACT STATED THE BRAKE LINES WERE CORRODED CAUSING THEM TO FAIL. WHILE COMING TO A STOP AND DEPRESSING THE BRAKE PEDAL THE VEHICLE WOULD NOT STOP UNTIL HE PULLED THE EMERGENCY BRAKE. THE VEHICLE WAS PULLED TO THE SIDE OF THE ROAD AND TOWED TO HIS HOME. AFTER INSPECTING THE BRAKE…
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TL* THE CONTACT OWNS A 2000 GMC SIERRA 1500. THE CONTACT STATED THE BRAKE LINES WERE CORRODED CAUSING THEM TO FAIL. WHILE COMING TO A STOP AND DEPRESSING THE BRAKE PEDAL THE VEHICLE WOULD NOT STOP UNTIL HE PULLED THE EMERGENCY BRAKE. THE VEHICLE WAS PULLED TO THE SIDE OF THE ROAD AND TOWED TO HIS HOME. AFTER INSPECTING THE BRAKES, HE NOTICED THE CORROSION ON THE BRAKE LINE AND BRAKE FLUID WAS LEAKING. THE DEALER NOR MANUFACTURER WERE NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 95,365.
NHTSA ODI #10411715
98,000 miles · Mar 9, 2011
Service Brakes, Hydraulic
BRAKE LINES CORRODED AND FAILED DURING DRIVING ON MAJOR FREEWAY. *TR
NHTSA ODI #10386997
53,000 miles · Feb 23, 2011
Service Brakes, Hydraulic
HAVE TO REPLACE ALL BRAKE LINES 2000 GMC SIERRA 4 X4 EXTENDED CAB. 53,000 MI. I HAVE BLOWN OUT BRAKE LINES 4 TIMES OVER LAST THREE YEARS. ALL LINES TO ANTI LOCK VALVE RUSTED THROUGH, FRONT BRAKE ,DRIVERS SIDE,REAR LINE DRIVERS SIDE. *TR
NHTSA ODI #10384097
104,434 miles · Feb 1, 2011
Service Brakes, Hydraulic
THE ORIGINAL FLEXIBLE BRAKE HOSE ON THE FRONT PASSENGER SIDE OF MY 2000 GMC SIERRA VEHICLE FAILED RESULTING IN THE LOSS OF FRONT BRAKES. IT APPEARS THAT THE HOSE IS TOO LONG AND THE HOSE RUBBED ON THE RIM. THE DELCO REPLACEMENT THAT I PURCHASED HAS BEEN TOTALLY REDESIGNED. IT IS MUCH SHORTER AND THE CONNECTION TO THE CALIPER …
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THE ORIGINAL FLEXIBLE BRAKE HOSE ON THE FRONT PASSENGER SIDE OF MY 2000 GMC SIERRA VEHICLE FAILED RESULTING IN THE LOSS OF FRONT BRAKES. IT APPEARS THAT THE HOSE IS TOO LONG AND THE HOSE RUBBED ON THE RIM. THE DELCO REPLACEMENT THAT I PURCHASED HAS BEEN TOTALLY REDESIGNED. IT IS MUCH SHORTER AND THE CONNECTION TO THE CALIPER HAS TO BE ANGLED AT A 45 DEGREE ANGLE, SO THAT THE WILL BE NO CONTACT WITH THE RIM. AFTER REPLACING THE PASSENGER SIDE, I CHECKED THE DRIVER'S SIDE HOSE AND FOUND THE SAME PROBLEM. THE HOSE SHOWS RUBBING IS OCCURRING. I WILL HAVE TO PUT A REPLACEMENT HOSE ON THAT SIDE ALSO. *LN
NHTSA ODI #10379844
85,000 miles · Jan 18, 2011
Service Brakes, Hydraulic
BRAKES FAILED ENTIRELY. LUCKILY I HAD AN EMERGENCY BRAKE. 7 BRAKE LINES HAD RUSTED OUT AND HAD TO BE REPLACED. - COST $1076. I HAVE ALSO HAD TO REPLACE MY REAR BRAKES 3 TIMES IN 86000 MILES. FRONT BRAKES WERE REPLACED ONLY ONCE. MECHANIC SAYS THAT PERHAPS THE PROPORTIONING VALUE IS NG. THERE WAS A RECALL BUT GM SAID IT DID NOT…
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BRAKES FAILED ENTIRELY. LUCKILY I HAD AN EMERGENCY BRAKE. 7 BRAKE LINES HAD RUSTED OUT AND HAD TO BE REPLACED. - COST $1076. I HAVE ALSO HAD TO REPLACE MY REAR BRAKES 3 TIMES IN 86000 MILES. FRONT BRAKES WERE REPLACED ONLY ONCE. MECHANIC SAYS THAT PERHAPS THE PROPORTIONING VALUE IS NG. THERE WAS A RECALL BUT GM SAID IT DID NOT INCLUDE MY VEHICLE. I THINK THIS WAS A LIE. *TR
NHTSA ODI #10377072
69,287 miles · Jan 10, 2011
Service Brakes, Hydraulic
WHILE DRIVING HOME I PUSHED THE BRAKE PEDAL AND EXPERIENCED A RUPTURED BRAKE LINE UNDER THE DRIVERS SIDE DOOR. LUCKILY NO CRASH OCCURRED BECAUSE I WAS ON A BACK ROAD WITH NO TRAFFIC. AFTER INSPECTION IT WAS CONFIRMED THAT ALL BRAKE LINES WERE VERY BADLY CORRODED AND ALL WERE READY TO FAIL. THE WORST DAMAGE APPEARED NEAR THE W…
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WHILE DRIVING HOME I PUSHED THE BRAKE PEDAL AND EXPERIENCED A RUPTURED BRAKE LINE UNDER THE DRIVERS SIDE DOOR. LUCKILY NO CRASH OCCURRED BECAUSE I WAS ON A BACK ROAD WITH NO TRAFFIC. AFTER INSPECTION IT WAS CONFIRMED THAT ALL BRAKE LINES WERE VERY BADLY CORRODED AND ALL WERE READY TO FAIL. THE WORST DAMAGE APPEARED NEAR THE WHEELS WHICH I WOULD ASSUME IS DUE TO ROAD SALT AND MOISTURE. *TR
NHTSA ODI #10375401
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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