# NHTSA Defect Petition DP78006
> **121 BRAKING SYSTEM (WARNER), AIR CONTROL** · Opened 1977-11-23 · Closed 1978-04-04
## Investigation
- **Action number:** DP78006
- **Type:** Defect Petition
- **Open date:** 1977-11-23
- **Close date:** 1978-04-04
- **Manufacturer:** —
- **Affected makes:** —
- **Affected components:** —
- **Affected model years:** —
- **Affected (make, year) variants:** 1
## Summary

121 BRAKING SYSTEM (WARNER), AIR CONTROL VALVE CLOGGED

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=DP78006)
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