NHTSA Office of Defects Investigation
Preliminary Evaluation PE06-041: BRAKE VACUUM BOOSTER HOSE COLLAPSES
- Closed
NHTSA's Office of Defects Investigation opened Preliminary Evaluation PE06-041 on September 18, 2006 and closed it on January 5, 2007. NHTSA's investigations file lists 3 Mitsubishi Fuso models for it and links recall 06V-477 to it.
Updated daily from NHTSA's investigations file
Key facts
- NHTSA number
- PE06-041 (also written PE06041)
- Investigation type
- Preliminary Evaluation The first stage of most defect investigations: NHTSA's Office of Defects Investigation gathers basic information about a possible safety defect, including from the manufacturer.
- Status
- Closed January 5, 2007
- Opened
- Closed
- Vehicle or equipment manufacturer
- Mitsubishi Fuso Truck of America, Inc.
- Components
- Service Brakes, Hydraulic — Foundation Components — Hoses, Lines/Piping, and Fittings; 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
- Recall linked by NHTSA
- 06V-477: BRAKE VACUUM HOSE, reported
- Vehicles and equipment
- 3 Mitsubishi Fuso models, including the FE84D and FE85D
NHTSA's summary
As NHTSA's Office of Defects Investigation wrote it for Preliminary Evaluation PE06-041.
THIS INVESTIGATION WAS OPENED BASED ON ODI'S RECEIPT OFEWR INFORMATION PERTAINING TO COLLAPSING BRAKE VACUUM HOSES ON THE SUBJECT VEHICLES.THE VEHICLES OF CONCERN ARE MEDIUM DUTY TRUCKS, MODEL YEARS 2006 - 2007,MODELS FE84D, FE85D AND FG84D.ODI MET WITH MITSUBISHI OFFICIALS AND DROVE A TRUCK WITH THE COLLAPSED HOSE.IT WAS DETERMINED THAT THE VACUUM BRAKE BOOSTER HOSE CAN FLATTEN OR COLLAPSE WHILE THE TRUCK IS BEING DRIVEN, RESULTING INDEGRADATION (REDUCED VACUUM) OF THE BRAKE POWER-ASSIST SYSTEM. THE REDUCTION IN AVAILABLE ENGINE VACUUM TO THE BRAKE BOOSTER REQUIRES THE DRIVER TO APPLY INCREASED BRAKE PEDAL PRESSURE TO ACHIEVE THE EXPECTED STOPPING DISTANCE. DURING THE INVESTIGATION, ODI LEARNED THAT THE BRAKE VACUUM HOSE WAS MANUFACTURED WITH INSUFFICIENT WALL THICKNESS, ALLOWING THE HOSE TO COLLAPSE DURING NORMAL VEHICLE OPERATION. DURING THE RECALL MITSUBISHI WILL REPLACE ALL VACUUM BRAKE BOOSTER HOSES ON THE APPLICABLE TRUCKS.THIS INVESTIGATION IS CLOSED.
Vehicles and equipment listed for this investigation
NHTSA's investigations file lists these vehicles and equipment for Preliminary Evaluation PE06-041. 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.
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 PE06-041
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.