NHTSA Office of Defects Investigation
Recall Query RQ06-007: BRAKE BOOSTER ACCUMULATOR FAILURE
- Closed
NHTSA's Office of Defects Investigation opened Recall Query RQ06-007 on May 24, 2006 and closed it on October 12, 2006. NHTSA's investigations file lists 3 models from 2 makes for it.
Updated daily from NHTSA's investigations file
Key facts
- NHTSA number
- RQ06-007 (also written RQ06007)
- Investigation type
- Recall Query An investigation into whether an existing recall covers the right vehicles or whether its remedy works, run much like a Preliminary Evaluation.
- Status
- Closed October 12, 2006
- Opened
- Closed
- Vehicle or equipment manufacturers
- Mitsubishi Motors North America, Inc.; MITSUBISHI CARIBBEAN
- Components
- Service Brakes, Hydraulic; Service Brakes, Hydraulic — Fluid; Service Brakes, Hydraulic — Power Assist; Service Brakes, Hydraulic — Power Assist — Hydraulic; Service Brakes, Hydraulic — Power Assist — Hydraulic — Hoses, Lines/Piping, and Fittings; Service Brakes, Hydraulic — Power Assist — Vacuum; Service Brakes, Hydraulic — Power Assist — Vacuum — Hoses, Lines/Piping, and Fittings
- Vehicles and equipment
- 3 models from 2 makes, including the Mitsubishi Caribbean Montero and Mitsubishi Montero
A recall appears here only when NHTSA's investigations file links one to the investigation; NHTSA's summary or record can name others.
NHTSA's summary
As NHTSA's Office of Defects Investigation wrote it for Recall Query RQ06-007.
IN OCTOBER 2001, MITSUBISHI NOTIFIED THE AGENCY THAT IT WOULD CONDUCT A SAFETY RECALL (NHTSA RECALL NO. 01V-254) TO REMEDY A DEFECT CONDITION THAT COULD RESULT IN A LEAK OF PRESSURIZED NITROGEN GAS FROM THE HYDRAULIC BRAKE BOOSTER ACCUMULATOR IN APPROXIMATELY 39,000 MODEL YEARS (MY) 2001-2002 MITSUBISHI MONTERO VEHICLES PRODUCED FROM DECEMBER 12, 1999 THROUGH JUNE 20, 2001. ACCORDING TO MITSUBISHI, THE ACCUMULATOR THAT IS INSTALLED ON THE HYDRAULIC BRAKE BOOSTER MAY HAVE BEEN MANUFACTURED IMPROPERLY, WHICH OVER A PERIOD OF TIME MAY RESULT IN LEAKAGE OF THE PRESSURIZED NITROGEN GAS FROM INSIDE THE ACCUMULATOR. THE LOSS OF THIS GAS PRESSURE MAY RESULT IN AN ABNORMAL NOISE FROM THE LEFT SIDE OF THE DASH PANEL WHEN THE BRAKES ARE APPLIED, AND POSSIBLY A DELAYED FIRST TIME BRAKE BOOST ASSIST AFTER THE VEHICLE HAS BEEN PARKED FOR A PERIOD OF TIME.DURING RQ06-007, MITSUBISHI INDICATED THAT THE DECISION TO CONDUCT RECALL 01V-254 WAS BASED ON PROJECTED FAILURE RATES OF 36.5% WITHIN 2-YEARS OF SERVICE AND 100% IN THE FIRST 4-YEARS OF SERVICE. THE OFFICE OF DEFECTS INVESTIGATION (ODI) OPENED RQ06-007 BASED ON SIX COMPLAINTS OF HYDRAULIC BRAKE BOOSTER ACCUMULATOR FAILURE IN THE APPROXIMATELY 23,335 MY 2002 MONTERO VEHICLES THAT WERE BUILT AFTER THE VEHICLES RECALLED IN 01V-254.
ONE OF THE COMPLAINTS ALLEGED THAT THE FAILURE RESULTED IN A CRASH.DURING THE INVESTIGATION, ODI IDENTIFIED 20 CONSUMER COMPLAINTS AND 58 WARRANTY CLAIMS RELATED TO BRAKE BOOSTER ACCUMULATOR FAILURE IN THE SUBJECT VEHICLES, RESULTING IN A COMPLAINT RATE OF APPROXIMATELY 85 PER 100,000 VEHICLES AND A WARRANTY CLAIM RATE OF 0.25%.
MITSUBISHI?S PROJECTED ACCUMULATOR FAILURE RATES AT 2- AND 4-YEARS IN SERVICE FOR THE SUBJECT VEHICLES WERE 0.5% AND 1.3% RESPECTIVELY AND ODI?S ANALYSES PRODUCED SIMILAR RESULTS.ODI?S INVESTIGATION FOUND THAT THE INCIDENTS OF INCREASED BRAKE PEDAL EFFORT TYPICALLY OCCURRED WITHIN THE FIRST FEW SECONDS AFTER THE ENGINE WAS STARTED AND WERE ACCOMPANIED BY NOISE ASSOCIATED WITH THE ACCUMULATOR CHARGING.ODI?S INVESTIGATION OF THE CRASH INCIDENT CONCLUDED THAT IT COULD NOT BE ATTRIBUTED TO THE ALLEGED DEFECT CONDITION.ODI ALSO COLLECTED AND ANALYZED DATA FOR POST-REMEDY ACCUMULATOR FAILURES IN VEHICLES THAT HAD THE 01V-254 REPAIRS COMPLETED.MITSUBISHI PROVIDED DATA DURING THE INVESTIGATION THAT INDICATED 95% OF THE RECALLED VEHICLES HAD RECEIVED THE RECALL REMEDY.FOR THESE VEHICLES, THERE WERE 14 COMPLAINTS AND 249 WARRANTY CLAIMS IDENTIFIED, RESULTING IN A COMPLAINT RATE OF 28 PER 100,000 VEHICLES AND A WARRANTY CLAIM RATE OF 0.64%.
ANALYSIS OF THESE FAILURES SHOWED A DECLINING TREND WITH INCREASING VEHICLE AGE, WITH ALMOST HALF OF THE WARRANTY CLAIMS OCCURRING WITHIN THE FIRST 12-MONTHS AFTER RECEIVING THE RECALL REMEDY. DUE TO THE LOW FAILURE RATES, ABSENCE OF RELATED CRASHES, AND NO INDICATION OF INCREASING FAILURE TRENDS IN EITHER THE SUBJECT VEHICLES OR POST-REPAIR RECALL POPULATION THIS INVESTIGATION IS CLOSED.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT A SAFETY-RELATED DEFECT DOES NOT EXIST.THE AGENCY WILL CONTINUE TO MONITOR COMPLAINTS AND OTHER INFORMATION RELATING TO THE ALLEGED DEFECT IN THE SUBJECT VEHICLES AND TAKE FURTHER ACTION IN THE FUTURE IF WARRANTED.
Vehicles and equipment listed for this investigation
NHTSA's investigations file lists these vehicles and equipment for Recall Query RQ06-007. A listed model year means only that an investigation names it; it says nothing about any particular vehicle. Model years with a try.vin recall page link to that page's NHTSA investigations section.
Mitsubishi
All Mitsubishi recallsMitsubishi Caribbean
Mitsubishi Caribbean Montero
What an NHTSA investigation is
NHTSA's Office of Defects Investigation (ODI) looks into possible safety defects in vehicles and equipment, often after owner complaints. An investigation usually starts as a Preliminary Evaluation, or as a Recall Query when it concerns whether an existing recall covers the right vehicles or fixes the problem, and ODI can upgrade it to a more detailed Engineering Analysis. A Defect Petition asks NHTSA to open an investigation, and Audit and Equipment Queries are administrative investigations into whether companies complied with federal vehicle safety requirements, such as reporting, recall and certification rules.
An open investigation is not a finding that a safety defect exists, and NHTSA can close one without a recall.
To see whether a specific vehicle has an open recall, enter its VIN at nhtsa.gov/recalls.
Free VIN check: decode a VIN to see its year, make and model.
Sources
NHTSA's investigation record for RQ06-007
Investigation details come from NHTSA's investigations file, which try.vin imports once a day. The investigation types are described from the U.S. Department of Transportation Inspector General's May 2023 report on NHTSA's Office of Defects Investigation, NHTSA's petition rules (49 CFR Parts 552 and 557) and NHTSA's Office of Defects Investigation procedures. How try.vin reads NHTSA investigations.