NHTSA safety investigation
NHTSA Investigation PE86073
Preliminary Evaluation · General Motors, LLC · SERVICE BRAKES, HYDRAULIC
An investigation is not a finding that a defect exists.
NHTSA opens an investigation to examine whether a safety defect may exist. An open investigation is not a determination that a defect exists, and many investigations close without a recall. Investigations can, however, lead to one.
What NHTSA is examining
The agency's own description of the inquiry, quoted as published
INEFFECTIVE AIR BRAKES
SUMMARY OF INFORMATION FROM MANUFACTURER:NONE AT THIS TIME.ANALYSIS:A PNEUMATIC BALANCE TEST PERFORMED ON FOUR OF THE SUBJECT BUSESBY AFTERMARKET BRAKE SYSTEM DISTRIBUTOR INDICATED THAT DURING A 15 PSIBRAKE APPLICATION, THERE WOULD BE 15 PSI AT THE FRONT AXLE AND 0 PSI ATTHE REAR.ONE OF THE KEYS TO BRAKE BALANCE IS BRAKE ACTUATION AND RELEASE.THE REAR SHOULD APPLY BEFORE THE FRONT AND RELEASE SLIGHTLY AFTER.SINCEMOST BRAKING OCCURS BELOW 20 PSI, IT WOULD SEEM THAT HAVING THE SAME ORCLOSE PRESSURE IN ALL CHAMBERS IS IMPORTANT FOR PROPER BALANCE.PROPOSED ACTION:OPEN A PE.SEND AN IR.
An investigation is a separate record from a recall and from a manufacturer communication. A manufacturer campaign to repair a safety defect or a failure to meet a federal safety standard.
Investigation details
Identifiers, dates and outcome as recorded by NHTSA
- Action number
- PE86073
- Investigation type
- Preliminary Evaluation (PE)
- Status
- Closed
- Manufacturer
- General Motors, LLC
- Component
- SERVICE BRAKES, HYDRAULIC
- Opened
- Aug 13, 1986
- Closed
- Oct 16, 1986
- Associated recall campaign
- None recorded
Vehicles named in this investigation
6 model years across 2 models
Being named here means NHTSA included the vehicle in the scope of its inquiry. It is not a statement that these vehicles have a defect.