# NHTSA Defect Petition DP78003
> **121 BRAKING SYSTEM, ERRATIC OPERATION** · Opened 1977-11-17 · Closed 1978-04-05
## Investigation
- **Action number:** DP78003
- **Type:** Defect Petition
- **Open date:** 1977-11-17
- **Close date:** 1978-04-05
- **Manufacturer:** General Motors, LLC
- **Affected makes:** CHEVROLET
- **Affected components:** SERVICE BRAKES, HYDRAULIC
- **Affected model years:** 1976
- **Affected (make, year) variants:** 1
## Summary

121 BRAKING SYSTEM, ERRATIC OPERATION

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=DP78003)
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