# NHTSA Engineering Analysis EA86006
> **BRAKE BACKING PLATE** · Opened 1985-11-27 · Closed 1988-11-28
## Investigation
- **Action number:** EA86006
- **Type:** Engineering Analysis
- **Open date:** 1985-11-27
- **Close date:** 1988-11-28
- **Manufacturer:** General Motors, LLC
- **Affected makes:** BUICK; CHEVROLET; GMC; OLDSMOBILE; PONTIAC
- **Affected components:** SERVICE BRAKES, HYDRAULIC
- **Affected model years:** 1978, 1979, 1980, 1981, 1982
- **Affected (make, year) variants:** 39
## Summary

SUMMARY:GM IS CONDUCTING A VOLUNTARY RECALL CAMPAIGN (85V-048)INVOLVING 2,136,826 VEHICLES. THE RECALL IS LIMITED TO VEHICLES BUILT ATCERTAIN ASSEMBLY PLANTS WHICH, ACCORDING TO GM, OVERTORQUED THE BRAKEPIPE NUT,THEREBY OVERSTRESSING THE WHEEL CYLINDER SUPPORT AREA OF THEBACKING PLATE.ANALYSIS:FRONT BRAKES PROVIDE SUFFICIENT BRAKING FOR PASSENGER CARSIN MOST NON-EMERGENCY SITUATIONS. ALL AFFECTED TRUCKS ARE INCLUDED INTHE CURRENT RECALL.IN MOST CASES THE PROBLEM IS DISCOVERED DURING BRAKEMAINTENANCE.THE RECALL APPEARS TO COVER THOSE GROUPS OF CARS WITH THEHIGHEST FAILURE RATES.STATUS:ANALYZING GM IR RESPONSE AND NEW COMPLAINT DATA. DRAFT CLOSINGREPORT BY 5/15/88.===

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=EA86006)
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