What NHTSA investigated
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 above identified problems may result in heat checking and cracking of the rear brake drums.
Vehicles covered
| Make | Model | Model years |
|---|---|---|
| Pierce | PIERCE | 1978–1986 |
Source
From NHTSA’s investigation file, rebuilt daily. To report a problem with your own vehicle, go to nhtsa.gov/report-a-safety-problem. All open investigations.