# NHTSA Preliminary Evaluation PE89116
> **BRAKE LAMP SWITCH** · Opened 1989-04-12 · Closed 1989-07-05
## Investigation
- **Action number:** PE89116
- **Type:** Preliminary Evaluation
- **Open date:** 1989-04-12
- **Close date:** 1989-07-05
- **Manufacturer:** General Motors, LLC
- **Affected makes:** CHEVROLET; GMC
- **Affected components:** SERVICE BRAKES, HYDRAULIC
- **Affected model years:** 1988, 1989
- **Affected (make, year) variants:** 8
## Summary

SUMMARY:TRUCK SERVICE BULLETIN OUTLINED PROCEDURES FOR ADJUSTMENT OFSTOP LAMP SWITCH.OTHER MANUFACTURERS HAVE TAKEN MORE FORMAL ACTION TOCORRECT MISADJUSTED/FAILED BRAKE LAMP SWITCHES.===

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=PE89116)
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