# NHTSA Defect Petition DP77008
> **POWER BRAKE BOOSTER** · Opened 1977-03-01 · Closed 1977-05-24
## Investigation
- **Action number:** DP77008
- **Type:** Defect Petition
- **Open date:** 1977-03-01
- **Close date:** 1977-05-24
- **Manufacturer:** General Motors, LLC
- **Affected makes:** CHEVROLET
- **Affected components:** SERVICE BRAKES, HYDRAULIC
- **Affected model years:** 1971, 1972, 1973, 1974, 1975, 1976, 1977
- **Affected (make, year) variants:** 7
## Summary

POWER BRAKE BOOSTER

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=DP77008)
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