Investigation PE88067: Vehicles

Status

CLOSED

Opened

Jun 28, 1988

Closed

Oct 19, 1988

Model years

—

Subject

Various brake problems

Component: Service brakes, hydraulic

Summary

Summary:recent rockwell defect report identified the following concerns:a: insufficient air pressure due to inadequate air compressor capacity;b: air horn plumbed into air system without pressure protection valve;c: brake imbalance caused by brake proportioning valves which reduce front axle brake line pressurethe problems identified above may result in heat checking andcracking of the rear drums.

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.