Investigation EA85031: 1983–1984 Ford F-250

Status

CLOSED

Opened

Jul 12, 1985

Closed

Oct 11, 1988

Model years

1983–1984

Subject

Rear wheel lockup

Component: Suspension

Summary

Summary: the 6.9l diesel engine was not utilized in the subject vehiclesprior to the 1983 model year.a proportioning valve was added and thefront brake metering valve (which delays front brake application) wasdeleted on 1984 models.ford issued a service bulletin in november 1983recommending that a 275 psi proportioning valve be installed for ownerswho complain of excessive rear brake sensitivity.analysis:the 6.9l diesel engine increases vehicle weight by almost900 lbs. Compared to a truck with a smaller v-8 gasoline engine. Most ofthe additional weight is supported by the front wheels.the design chan-ges incorporated in 1984 appear to have corrected the problem.status:final etf test report received 6/15/87.ir response dated10/12/87.

An NHTSA investigation looks into whether a safety defect exists. Opening one is not a finding. Outcomes can include a recall, closure without action, or further inquiry.

Model years covered

• 1984 Ford F-25010 complaints