# NHTSA Engineering Analysis EA89028
> **REAR BRAKE PIN** · Opened 1989-07-28 · Closed 1990-07-27
## Investigation
- **Action number:** EA89028
- **Type:** Engineering Analysis
- **Open date:** 1989-07-28
- **Close date:** 1990-07-27
- **Manufacturer:** General Motors, LLC
- **Affected makes:** BUICK; CADILLAC; OLDSMOBILE; PONTIAC
- **Affected components:** SERVICE BRAKES, HYDRAULIC
- **Affected model years:** 1986, 1987
- **Affected (make, year) variants:** 12
## Summary

SUMMARY:THESE VEHICLES HAVE REAR DRUM BRAKES.THE PARKING LEVER PIVOTPIN IS HELD BY AN E RING.WHEN THE RING FAILS, PARTS OF THE RING ANDPIN FALL LOOSE INTO THE DRUM AND MAY JAM THE BRAKE, LOCKING THE WHEEL.A STRONGER E RING IS USED IN 1988 AND NEWER CARS.THIS INVESTIGATIONHAS BEEN EXPANDED TO INCLUDE GMS C BODY CARS LISTED ABOVE (E RING COMMONTO ALL CARS SHOWN).===

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=EA89028)
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