NHTSA owner reports · September 18, 2026 snapshot.
Service Brakes, Hydraulic complaints
237 reportsClear category filter110,000 miles · Jan 5, 2011
Service Brakes, Hydraulic
TL*THE CONTACT OWNS A 2000 CHEVROLET SILVERADO 1500. WHILE DRIVING APPROXIMATELY 50 MPH PRESSURE WAS APPLIED TO THE BRAKE PEDAL AND THE PEDAL DEPRESSED TO THE FLOOR. THE VEHICLE COASTED TO A STOP AND WAS DRIVEN TO AN AUTHORIZED DEALER WHERE THE CONTACT WAS TOLD THAT ALL OF THE BRAKE LINES WERE CORRODED. THE CONTACT WAS ALSO TOLD…
Read full complaint
TL*THE CONTACT OWNS A 2000 CHEVROLET SILVERADO 1500. WHILE DRIVING APPROXIMATELY 50 MPH PRESSURE WAS APPLIED TO THE BRAKE PEDAL AND THE PEDAL DEPRESSED TO THE FLOOR. THE VEHICLE COASTED TO A STOP AND WAS DRIVEN TO AN AUTHORIZED DEALER WHERE THE CONTACT WAS TOLD THAT ALL OF THE BRAKE LINES WERE CORRODED. THE CONTACT WAS ALSO TOLD TO REPLACE ALL OF THE BRAKE LINES. THE VEHICLE WAS NOT REPAIRED. THE FAILURE AND CURRENT MILEAGES WERE 110,000.
NHTSA ODI #10374730
60,400 miles · Jan 4, 2011
Service Brakes, Hydraulic
TL*THE CONTACT OWNS 2000 CHEVROLET SILVERADO 1500. THE CONTACT STATED THAT WHILE DRIVING 15 MPH, HE APPLIED THE BRAKES AND THE PEDAL WENT TO THE FLOORBOARD. HE MENTIONED THAT THE ONLY WAY HE WAS ABLE TO STOP THE VEHICLE WAS BY APPLYING THE PARKING BRAKE. THE VEHICLE WAS TAKEN TO A LOCAL MECHANIC WHO STATED THAT THERE MULTIPLE BR…
Read full complaint
TL*THE CONTACT OWNS 2000 CHEVROLET SILVERADO 1500. THE CONTACT STATED THAT WHILE DRIVING 15 MPH, HE APPLIED THE BRAKES AND THE PEDAL WENT TO THE FLOORBOARD. HE MENTIONED THAT THE ONLY WAY HE WAS ABLE TO STOP THE VEHICLE WAS BY APPLYING THE PARKING BRAKE. THE VEHICLE WAS TAKEN TO A LOCAL MECHANIC WHO STATED THAT THERE MULTIPLE BRAKE LINE FAILURE DUE TO CORROSION. THE VEHICLE WAS REPAIRED. THE MANUFACTURER WAS OFFERED NO ASSISTANCE. THE FAILURE AND CURRENT MILEAGES WERE 60,400.
NHTSA ODI #10374096
200,000 miles · Dec 29, 2010
Service Brakes, Hydraulic
WHILE DOING A NORMAL STOP, THE BRAKE PEDAL WENT ALL THE WAY TO THE FLOOR. I CHECKED AND THE BRAKE LINE IS CORRODED AND LEAKING NEAR THE DRIVER SIDE REAR TIRE. *TR
NHTSA ODI #10373307
20,462 miles · Dec 18, 2010
Service Brakes, Hydraulic
BRAKES WENT TO THE FLOOR WHEN TRYING TO STOP 5 DIFFERENT INCIDENCES. NO ACCIDENT, NO INJURIES. CAUSE CORROSION OF BRAKE LINES. 8/4/06 - 20,462 MILES, 2/28/07 - 22,872 MILES, 11/28/07 - 25,849 MILES, 6/9/10 - 37,486 MILES, 12/18/10 - 39,000 MILES (CURRENTLY WAITING TO BE FIXED).
NHTSA ODI #10371714
170,000 miles · Nov 29, 2010
Service Brakes, Hydraulic
WHILE DRIVING MY SILVERADO DOWN THE FREEWAY AT 65MPH THE ABS LIGHT JUST CAME ON WITHOUT WARNING OR TOUCHING THE BRAKES. LIGHT STAYS ON, AND ABS DOES NOT OPERATE AT ALL NOW, BRAKES FEEL SOFT AND SPONGY AND UNSAFE. I KNOW THERE WAS A RECALL ON THESE TRUCKS, I CALLED THE DEALERSHIP AND THEY SAID YES THERE WAS BUT MY VIN. NUMBER WAS…
Read full complaint
WHILE DRIVING MY SILVERADO DOWN THE FREEWAY AT 65MPH THE ABS LIGHT JUST CAME ON WITHOUT WARNING OR TOUCHING THE BRAKES. LIGHT STAYS ON, AND ABS DOES NOT OPERATE AT ALL NOW, BRAKES FEEL SOFT AND SPONGY AND UNSAFE. I KNOW THERE WAS A RECALL ON THESE TRUCKS, I CALLED THE DEALERSHIP AND THEY SAID YES THERE WAS BUT MY VIN. NUMBER WASN'T EFFECTED IN THE RECALL. I BELIEVE IT SHOULD BE AS I'VE READ A LOT OF COMPLAINTS ON THIS ISSUE WITH THESE TRUCKS. I BELIEVE GM HAS A PROBLEM AND IT NEEDS ADDRESSED.
NHTSA ODI #10368809
75,000 miles · Nov 22, 2010
Service Brakes, Hydraulic
TL*THE CONTACT OWNS A 2000 CHEVROLET SILVERADO 1500. WHILE DRIVING UNDER 10 MPH, THE ABS UNIT ACTIVATED BEFORE THE VEHICLE WAS BROUGHT TO A COMPLETE STOP. THE CONTACT HAD TO ENGAGE THE BRAKES HARDER TO STOP THE VEHICLE. THE FAILURE OCCURRED INTERMITTENTLY. THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER WHO STATED THAT HE WOULD HA…
Read full complaint
TL*THE CONTACT OWNS A 2000 CHEVROLET SILVERADO 1500. WHILE DRIVING UNDER 10 MPH, THE ABS UNIT ACTIVATED BEFORE THE VEHICLE WAS BROUGHT TO A COMPLETE STOP. THE CONTACT HAD TO ENGAGE THE BRAKES HARDER TO STOP THE VEHICLE. THE FAILURE OCCURRED INTERMITTENTLY. THE VEHICLE WAS TAKEN TO AN AUTHORIZED DEALER WHO STATED THAT HE WOULD HAVE TO PAY FOR THE REPAIR EXPENSES. THE CONTACT WAS INFORMED BY THE MANUFACTURER THAT RECALL 05V379000 (SERVICE BRAKES, HYDRAULIC: ANTI LOCK) HAD PREVIOUSLY BEEN PERFORMED. THE CURRENT AND FAILURE MILEAGES WERE APPROXIMATELY 75,000.
NHTSA ODI #10367152
92,000 miles · Nov 17, 2010
Service Brakes, Hydraulic
TL*THE CONTACT OWNS A 2000 CHEVROLET SILVERADO 1500. WHILE DRIVING APPROXIMATELY 30 MPH APPROACHING A RED LIGHT, THE BRAKES SUDDENLY FAILED; THE BRAKE PEDAL EXTENDED TO THE FLOORBOARD. THE CONTACT USED THE EMERGENCY BRAKES TO STOP THE VEHICLE. THE VEHICLE WAS TAKEN TO A LOCAL REPAIR SHOP WHERE THE CONTACT WAS INFORMED THAT THE B…
Read full complaint
TL*THE CONTACT OWNS A 2000 CHEVROLET SILVERADO 1500. WHILE DRIVING APPROXIMATELY 30 MPH APPROACHING A RED LIGHT, THE BRAKES SUDDENLY FAILED; THE BRAKE PEDAL EXTENDED TO THE FLOORBOARD. THE CONTACT USED THE EMERGENCY BRAKES TO STOP THE VEHICLE. THE VEHICLE WAS TAKEN TO A LOCAL REPAIR SHOP WHERE THE CONTACT WAS INFORMED THAT THE BRAKE LINE WAS RUSTED AND BRAKE FLUID HAD LEAKED OUT. THE MECHANIC REPLACED A PART OF THE BRAKE LINE AND INFORMED THE CONTACT THE REPAIR WAS A TEMPORARY FIX. THE FAILURE MILEAGE WAS APPROXIMATELY 92,000 AND THE CURRENT MILEAGE WAS 92,400. UPDATED 01/26/11*LJ UPDATED 04/04/11 *JB
NHTSA ODI #10366558
140,000 miles · Nov 6, 2010
Service Brakes, HydraulicCrash
100% BRAKE FAILURE, FLUID LEAKING FROM BRAKE LINE UNDER TRUCK, LOSS OF BRAKE PEDAL AT STOP, NOT ABLE TO AVOID STOPPED VEHICLE AT TRAFFIC LIGHT, HAVE TRUCK TOWED FROM SCENE. *TR
NHTSA ODI #10364244
140,000 miles · Nov 1, 2010
Service Brakes, Hydraulic
TL*THE CONTACT OWNS A 2000 CHEVROLET SILVERADO 1500. WHILE DRIVING 30 MPH, THE CONTACT ATTEMPTED TO SLOW THE VEHICLE DOWN AND THE BRAKE PEDAL EXTENDED TO THE FLOORBOARD AND WOULD NOT ENGAGE. THE CONTACT STEERED INTO THE GRASS TO BRING THE VEHICLE TO A STOP. THE CONTACT INSPECTED AND DISCOVERED THAT ALL THE BRAKE LINES WERE CORRO…
Read full complaint
TL*THE CONTACT OWNS A 2000 CHEVROLET SILVERADO 1500. WHILE DRIVING 30 MPH, THE CONTACT ATTEMPTED TO SLOW THE VEHICLE DOWN AND THE BRAKE PEDAL EXTENDED TO THE FLOORBOARD AND WOULD NOT ENGAGE. THE CONTACT STEERED INTO THE GRASS TO BRING THE VEHICLE TO A STOP. THE CONTACT INSPECTED AND DISCOVERED THAT ALL THE BRAKE LINES WERE CORRODED. THE VEHICLE HAD NOT BEEN REPAIRED. THE CURRENT AND FAILURE MILEAGES WERE APPROXIMATELY 140,000.
NHTSA ODI #10363449
150,000 miles · Oct 26, 2010
Service Brakes, Hydraulic
I HAVE A 2000 CHEVY SILVERADO THAT HAS HAD A RECALL ON THE ABS SYSTEM. THE SYSTEM GETS CORROSION AND THEN AT LOW SPEEDS WONT ALLOW YOU TO STOP WHEN PLANNED. THE ABS ACTIVATES ON DRY PAVEMENT. I HAVE ALMOST HIT SEVERAL VEHICLES CAUSE OF THIS. THERE HAS BEEN A RECALL ON THIS AND THE TRUCK WAS FIXED ONCE, BUT NOW IT IS DOING IT AGA…
Read full complaint
I HAVE A 2000 CHEVY SILVERADO THAT HAS HAD A RECALL ON THE ABS SYSTEM. THE SYSTEM GETS CORROSION AND THEN AT LOW SPEEDS WONT ALLOW YOU TO STOP WHEN PLANNED. THE ABS ACTIVATES ON DRY PAVEMENT. I HAVE ALMOST HIT SEVERAL VEHICLES CAUSE OF THIS. THERE HAS BEEN A RECALL ON THIS AND THE TRUCK WAS FIXED ONCE, BUT NOW IT IS DOING IT AGAIN AND CHEVROLET WONT TAKE CARE OF IT A SECOND TIME. THEY NEED TO STEP UP AND TAKE CARE OF THEIR ISSUES. *TR
NHTSA ODI #10362542
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.
Illustration