NHTSA owner reports · September 18, 2026 snapshot.
Service Brakes complaints
30 reportsClear category filter97,000 miles · Dec 3, 2013
Service Brakes
TL* THE CONTACT OWNS A 1999 GMC K1500 SIERRA. THE CONTACT STATED THAT THE WHILE REVERSING, THE BRAKES FAILED TO ENGAGE. THE CONTACT LATER INSPECTED THE VEHICLE AND DISCOVERED THAT BRAKE FLUID WAS LEAKING FROM THE BRAKE LINES. THE VEHICLE WAS NOT TAKEN TO THE DEALER FOR INSPECTION OR REPAIRS. THE MANUFACTURER WAS NOT MADE AWARE O…
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TL* THE CONTACT OWNS A 1999 GMC K1500 SIERRA. THE CONTACT STATED THAT THE WHILE REVERSING, THE BRAKES FAILED TO ENGAGE. THE CONTACT LATER INSPECTED THE VEHICLE AND DISCOVERED THAT BRAKE FLUID WAS LEAKING FROM THE BRAKE LINES. THE VEHICLE WAS NOT TAKEN TO THE DEALER FOR INSPECTION OR REPAIRS. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE APPROXIMATE FAILURE AND CURRENT MILEAGE WAS 97,000. UPDATED 01/14/14*LJ THE CONSUMER STATED 9 BRAKE LINES WERE REPLACED. UPDATED 01/16/14
NHTSA ODI #10554597
172,000 miles · Jul 2, 2013
Service Brakes
I STARTED MY TRUCK TO PULL OUT OF MY DRIVEWAY MONDAY 7-1-2013 BRAKE PEDAL HIT THE FLOOR..CHECKING THE SYSTEM I FOUND FLUID LEAK UNDER REAR OF TRUCK. LINE RUST COLOR, LEAK, AIR COMING FROM LINE. CALLED MECHANIC. WILL HAVE RESULTS NEXT WEEK. TRUCK HAS TO BE TOWED..IF I HAD BEEN DRIVING I WOULD HAVE BEEN IN A CRASH...THIS SITUATION…
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I STARTED MY TRUCK TO PULL OUT OF MY DRIVEWAY MONDAY 7-1-2013 BRAKE PEDAL HIT THE FLOOR..CHECKING THE SYSTEM I FOUND FLUID LEAK UNDER REAR OF TRUCK. LINE RUST COLOR, LEAK, AIR COMING FROM LINE. CALLED MECHANIC. WILL HAVE RESULTS NEXT WEEK. TRUCK HAS TO BE TOWED..IF I HAD BEEN DRIVING I WOULD HAVE BEEN IN A CRASH...THIS SITUATION NEEDS SERIOUS ATTENTION......I AM BLESSED. WILL UPDATE FROM MECHANIC NEXT WEEK.
NHTSA ODI #10522975
3,045,251 miles · Jun 17, 2013
Service Brakes
I WAS BACKING OUT OF MY DRIVEWAY WHEN MY BRAKES WENT TO THE FLOOR, ALWAYS NOTICED HOW RUSTY THE TRUCK IS UNDERNEATH, AND THE OUTSIDE LOOKS LIKE NEW. WHAT HAD HAPPEN IS A WHOLE IN MY BRAKE LINE .I DONE SOME RESEARCH AND NOTICED ABOUT 6 MILLION OTHER PEOPLE HAVE HAD THE SAME ISSUE..DEFINITELY THINK GM SHOULD PAY FOR NEW BRAKE LINE…
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I WAS BACKING OUT OF MY DRIVEWAY WHEN MY BRAKES WENT TO THE FLOOR, ALWAYS NOTICED HOW RUSTY THE TRUCK IS UNDERNEATH, AND THE OUTSIDE LOOKS LIKE NEW. WHAT HAD HAPPEN IS A WHOLE IN MY BRAKE LINE .I DONE SOME RESEARCH AND NOTICED ABOUT 6 MILLION OTHER PEOPLE HAVE HAD THE SAME ISSUE..DEFINITELY THINK GM SHOULD PAY FOR NEW BRAKE LINES, WHY WOULD THEY BUILD A VEHICLE THAT'S NOT SAFE FOR AT LEAST 15 YEARS..DON'T THINK I'LL EVER OWN ANOTHER GM PRODUCT. *TR
NHTSA ODI #10520187
99,000 miles · Mar 5, 2013
Service Brakes
BRAKE PEDAL WENT TO FLOOR DUE TO PREMATURE BRAKE LINE FAILURE. WAS ABLE TO DOWN SHIFT AND CURB THE VEHICLE TO STOP IN TIME. *TR
NHTSA ODI #10501442
199,000 miles · Dec 31, 2012
Service Brakes
I WAS IN A DRIVEWAY AND ATTEMPTED TO STOP TO TURN ONTO THE MAIN ROAD, WHEN I PRESSED THE BRAKES THEY WENT TO THE FLOOR. I USED THE PARK BRAKE TO STOP AND RETURNED HOME. I FOUND THE LEAK, IT IS ON THE BRAKE LINE WHERE A GROUP OF FOUR LINES RUN ALONG THE FRAME UNDER THE DRIVERS SEAT. *TR
NHTSA ODI #10490596
40,000 miles · Oct 21, 2012
Electrical SystemService Brakes
EXCESSIVE RUST BUILD UP ON BRAKE ROTORS AND CALIPERS. ROTORS & PADS PREVIOUSLY REPLACED IN MAR., 2007 AFTER DRIVING 40,000 MILES. NEEDED REPLACEMENT AGAIN IN OCT., 2009 AFTER ONLY DRIVING 14,000 ADDITIONAL MILES. INSTRUMENT CLUSTER FAILED AND WAS REPLACED IN JUNE, 2011 AT 58,000 MILES. DEALER ADVISED NO RECALL ON THIS MODE…
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EXCESSIVE RUST BUILD UP ON BRAKE ROTORS AND CALIPERS. ROTORS & PADS PREVIOUSLY REPLACED IN MAR., 2007 AFTER DRIVING 40,000 MILES. NEEDED REPLACEMENT AGAIN IN OCT., 2009 AFTER ONLY DRIVING 14,000 ADDITIONAL MILES. INSTRUMENT CLUSTER FAILED AND WAS REPLACED IN JUNE, 2011 AT 58,000 MILES. DEALER ADVISED NO RECALL ON THIS MODEL, ALTHOUGH IDENTICAL INSTRUMENT CLUSTERS FOR NEWER VEHICLES HAD BEEN RECALLED AND WERE BEING REPLACED AT NO CHARGE. *TR
NHTSA ODI #10481287
235,000 miles · Oct 2, 2012
Service Brakes
PUT VEHICLE IN GEAR , NO BRAKE PEDAL .... BRAKE LINES WERE RUSTED AND FAILED......... HAD ALL 5 LINES REPLACED......... *TR
NHTSA ODI #10478363
190,000 miles · Sep 18, 2012
Service Brakes
I WAS COMING UPON A RED LIGHT BEHIND OTHER TRAFFIC. I STEPPED DOWN ON THE BRAKES TO STOP, AND THE PEDDLE FELT SPONGY. I TRIED PUMPING THEM, THEN NOTHING. I AVOIDED HITTING THE TRUCK IN FRONT OF ME BY SWERVING ACROSS INTO THE OTHER LANE AND PULLING INTO A PARKING LOT, WERE I WAS ABLE TO BRING THE VEHICLE TO A STOP. THE BRAKE WA…
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I WAS COMING UPON A RED LIGHT BEHIND OTHER TRAFFIC. I STEPPED DOWN ON THE BRAKES TO STOP, AND THE PEDDLE FELT SPONGY. I TRIED PUMPING THEM, THEN NOTHING. I AVOIDED HITTING THE TRUCK IN FRONT OF ME BY SWERVING ACROSS INTO THE OTHER LANE AND PULLING INTO A PARKING LOT, WERE I WAS ABLE TO BRING THE VEHICLE TO A STOP. THE BRAKE WARNING LIGHT NEVER CAME ON, AND I DON'T UNDERSTAND WHILE IT WAS A TOTAL BRAKE FAILURE, I THOUGHT THAT'S WHY THERE IS A DUAL RESERVOIR, AND THERE WAS STILL PLENTY OF FLUID IN BOTH. UPON INSPECTION, I SAW THE BRAKE LINES WERE ALL SEVERELY CORRODED, AND THE ONE GOING TO THE REAR BRAKES WAS SPLIT. I KNOW I LIVE IN MICHIGAN, AND THE TRUCK IS RUSTY(THANKS AGAIN GM) BUT I HAVE CARS OVER 40 YEARS OLD WITH ORIGINAL LINES ON THEM WITH ABSOLUTELY NO CORROSION ON THEM. THIS IS A SUBSTANDARD PART, THAT NEEDS TO BE RECALLED BEFORE MORE PEOPLE ARE INJURED OR KILLED. *TR
NHTSA ODI #10475848
175,000 miles · Aug 17, 2012
Service Brakes
AS I WAS APPROACHING A STOPLIGHT, MY BRAKE PEDAL WENT TO THE FLOOR. I LIMPED IT AROUND THE CORNER AND FOUND A HOLE IN A HARD BRAKE LINE. I HAD IT REPAIRED BY A CERTIFIED MECHANIC. NOW A SECOND RUPTURE HAS OCCURRED. THIS SEEMS TO BE A RESULT OF CORROSION. *TR
NHTSA ODI #10471240
192,150 miles · Jun 26, 2012
Service BrakesService Brakes, Hydraulic
STOPPED IN MY DRIVEWAY TO GET NEWSPAPER AND MAIL. I GOT BACK INTO THE TRUCK AND APPLIED THE BRAKE TO SHIFT INTO DRIVE. THE BRAKE PEDAL WENT TO THE FLOOR. I COASTED UP THE DRIVEWAY AND WAS ABLE TO STOP. WHEN I GOT OUT OF THE TRUCK THERE WAS A TRAIL OF BRAKE FLUID. THE LEAK WAS COMING FROM UNDER THE DRIVER'S SEAT AREA, WHERE THE B…
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STOPPED IN MY DRIVEWAY TO GET NEWSPAPER AND MAIL. I GOT BACK INTO THE TRUCK AND APPLIED THE BRAKE TO SHIFT INTO DRIVE. THE BRAKE PEDAL WENT TO THE FLOOR. I COASTED UP THE DRIVEWAY AND WAS ABLE TO STOP. WHEN I GOT OUT OF THE TRUCK THERE WAS A TRAIL OF BRAKE FLUID. THE LEAK WAS COMING FROM UNDER THE DRIVER'S SEAT AREA, WHERE THE BRAKE LINE ATTACHED TO THE ABS PUMP. MY MECHANIC HAD TO REPLACE ALL OF THE BRAKE LINES. *JB
NHTSA ODI #10463161
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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