Investigation PE88073: Vehicles

Status

CLOSED

Opened

Jun 29, 1988

Closed

Aug 31, 1988

Model years

—

Subject

Various brake problems

Component: Service brakes, hydraulic

Summary

Summary: recent rockwell defect report identified the following additional 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 the front brake pressures. The problems identified above may result in heat checking and cracking of the rear brake 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.