Brakes grind, pulse or wear early

On April 29, 2015, the Office of Defects Investigation (ODI) opened PE15-017 to investigate a report alleging incidents of front brake hose failure in model year (MY) 2015 Ford Explorer Police Interceptor vehicles used by the Sacramento Police Department in its pursuit driving training program (VOQ 10705832).On September 28, 2015, ODI upgraded the investigation to an Engineering Analysis (EA15-005) to assess maximum front caliper crimp temperatures under various test conditions, test hose assemblies removed from police interceptor service for any signs of thermal degradation, and further assess field data for evidence of a defect trend related to the alleged defect.The alleged defect results from exposure to extremely high heat at the caliper-side hose crimp. NHTSA?s vehicle testing suggests that the conditions necessary to produce the critical temperatures in the subject components result from drive-soak intervals that can occur during the Sacramento training program.NHTSA's testing of hose assemblies returned from police interceptor service did not identify any evidence of thermal degradation.NHTSA has not confirmed any incidents of caliper crimp failures due to overheating in vehicles not subjected to the Sacramento training course driving.The low number of hose assembly failure reports and the absence of any verified incidents of heat related front brake hose crimp failures since 2015 suggests that the Sacramento PD incidents resulted from conditions unique to the trainin

On April 29, 2015, the Office of Defects Investigation (ODI) opened PE15-017 to investigate reports of low-mileage failures of front brake jounce hoses in model year (MY) 2015 Ford Explorer Police Interceptor vehicles operated as training vehicles by the City of Sacramento, California (ODI VOQ No. 10705832). To date, the Sacramento police fleet has reported a total of 7 front hose failures in 5 different Explorer Police Interceptor vehicles used for its Emergency Vehicle Operation Course (EVOC) training. Most of the failures occurred within the first few miles of service on a closed course used for the EVOC program, which includes evasive accident avoidance and pursuit maneuver training. The hose assemblies either leaked at, or pulled completely free from, the caliper-end attachment where the hose is crimped to the steel end fitting. Most of the failures resulted in a sudden loss of braking performance that caused the vehicle to run off the intended course. None of the failures resulted in any crashes, injuries or property damage.The subject MY 2015 hose assemblies are similar in design to hoses used on MY 2013 through 2014 Explorer Police Interceptor and civilian vehicles. The 5 vehicles used by Sacramento EVOC have all been repaired using MY 2016 front hose assemblies that have been changed to incorporate a short steel tube attached to the caliper end banjo block. No failures have been experienced by the Sacramento fleet to date in the other 37 MY 2014-2015 Explorer Police

The Office of Defects Investigation (ODI) opened PE14-027 based on a report of 13 front brake hose (jounce hose) failures in 11 vehicles in the District of Columbia Metropolitan Police Department (DCMPD) fleet of 46 model year (MY) 2013 Ford Explorer Police Interceptor (PI) vehicles (VOQ 10621634).The DCMPD fleet provided Ford with 71 jounce hoses for analysis, including 4 of the 13 failed hoses.Inspection of each of the failed hoses identified a small tear in the outer cover on the body end of the hoses on the outboard side. Ford?s lab analysis of these hoses identified splits in the inner liners 1.5-2.0mm from the end of the nipple (outside of the crimped ferrule joint).Ford conducted pressure testing of 10 randomly selected samples of the remaining 67 hoses that had not experienced leaks and 9 of the samples leaked at 6,000 psi.Ford?s examination of the 9 hoses that leaked in the pressure tests found 4 that failed on the outboard side of the hose (similar to the 4 leaking field parts) and 5 that failed on the body end of the hose on the inboard side.Four additional non-leaking hoses were sent to the hose supplier, Hitachi, for analysis.Broken yarn was observed in scanning electron microscope examinations at both the body side and caliper side hose to ferrule crimps, indicating severe bending stress had occurred at these locations. Hitachi supplied an additional set of non-leaking field return hoses and a brand new set of hoses to an outside laboratory (Element Materials Te

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ODI HAS RECEIVED OND HUNDRED SEVENTY-THREE (173) CONSUMER COMPLAINTS OF ALLEGED FAILURES OR MALFUNCTIONS IN THE BRAKING SYSTEM ON CERTAIN 1993 AND 1994 FORD EXPLORERS.THESE ALLEGED FAILURES OR MALFUNCTIONS ARE REPORTED TO HAVE CAUSED THIRTY-SIX (36) ACCIDENTS RESULTING FROM VEHICLE LOSS OF DIRECTIONAL CONTROL DURING BRAKING OR FROM THE EXTENDED DISTANCE REQUIRED TO STOP THE VEHICLE DURING BRAKING.THE COMPLAINANTS REPORT THAT THE ALLEGED FAILURES OR MALFUNCTIONS OCCURRED DURING BRAKING MOSTLY ON WET OR SLIPPERY ROADS, BUT ALSO HAVE OCCURRED ON DRY ROADS.SINCE ODI OPENED THIS PE BASED ON WHEEL LOCKUP COMPLAINTS, WE HAVE RECEIVED NUMEROUS ADDITIONAL COMPLAINTS AB OUT THE EXTENDED DISTANCE REQUIRED TO STOP THE SUBJECT VEHICLES WHEN BRAKING UNDER CERTAIN ROAD AND SPEED CONDITIONS.IN RESPONSE TO ODI'S INFORMATION REQUEST (IR) CONCERNING WHEEL LOCKUP COMPLAINTS ONT HE SUBJECT VEHICLES, FORD REPORTED RECEIVING 416 REPORTS (FIELD REPORTS, OWNER COMPLAINTS, AND SUBROGATION CLAIMS) OF WHEEEL LOCKUP ON 1993 AND 1994 FORD EXPLORERS, WITH 24 ALLEGED ACCIDENTS.IN ADDITION, FORD REPORTED RECEIVING 24,916 WARRANTY CLAIMS THAT COULD RELATE TO THE ALLEGED DEFECT OF WHEEL LOCKUP DURING BRAKING ON THE SUBJECT VEHICLES.AN ENGINEERING ANALYSIS IS WARRANTED TO DETERMINE THE SCOPE OF THESE ALLEGED BRAKING SYSTEM FAILURES OR MALFUNCTIONS ON 1993 AND 1994 FORD EXPLORERS.

FORD CONTINUES TO SUDY THE PROBLEM ATTEMPTING TO DETERMINE WHY STUD FRACTURES ARE NOT FREQUENTLY OCCURRING IN OTHER PARTS OF THE COUNTRY.LIKEWISE, ODI CONTINUES GATHERING INFORMATION TO ASCERTAIN WHETHER THE RECALL SCOPE SHOULD INCLUDE OTHER GEOGRAPHICAL AREAS.IF EVIDENCE INDICATES THE SCOPE SHOULD BE EXPANDED, ODI WILL REOPEN THE INVESTIGATION AS WARRANTED.

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There is no summary currently available