# NHTSA SQ SQ98001
> **AD-IP PURGE VALVE UPDATE AND CHANGEUP** · Opened 1998-01-22 · Closed 1998-07-31
## Investigation
- **Action number:** SQ98001
- **Type:** SQ
- **Open date:** 1998-01-22
- **Close date:** 1998-07-31
- **Manufacturer:** ALLIEDSIGNAL INC.
- **Affected makes:** ALLIED SIGNAL
- **Affected components:** SERVICE BRAKES, AIR:DISC:ROTOR
- **Affected model years:** 9999
- **Affected (make, year) variants:** 1
## Summary

ALLIEDSIGNAL ISSUED A TSB INFORMING DEALERS OF THE AVAILABILITY OF A UPGRADED PURGE VALVE FOR AIR BRAKE AIR DRY ASSEMBLIES

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=SQ98001)
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