# NHTSA Defect Petition DP88010
> **BRAKE PROPORTIONING VALVE** · Opened 1988-01-22 · Closed 1988-03-01
## Investigation
- **Action number:** DP88010
- **Type:** Defect Petition
- **Open date:** 1988-01-22
- **Close date:** 1988-03-01
- **Manufacturer:** General Motors, LLC
- **Affected makes:** BUICK; CHEVROLET; OLDSMOBILE; PONTIAC
- **Affected components:** SERVICE BRAKES, HYDRAULIC
- **Affected model years:** 1985, 1986
- **Affected (make, year) variants:** 8
## Summary

BRAKE PROPORTIONING VALVE

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=DP88010)
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