# NHTSA Defect Petition DP86020
> **EXPEDITE DETERMINATN OF DEFECT IN C84-01** · Opened 1986-09-18 · Closed 1986-10-06
## Investigation
- **Action number:** DP86020
- **Type:** Defect Petition
- **Open date:** 1986-09-18
- **Close date:** 1986-10-06
- **Manufacturer:** General Motors, LLC
- **Affected makes:** BUICK; CHEVROLET
- **Affected components:** SERVICE BRAKES, HYDRAULIC
- **Affected model years:** 1980
- **Affected (make, year) variants:** 2
## Summary

EXPEDITE DETERMINATN OF DEFECT IN C84-01 POWER BRAKE ASSIST

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=DP86020)
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