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Service bulletin 4891

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id601762
Published by NHTSA1998-08-24
Manufacturer's number4891
Manufacturer's date1998-03-30
NHTSA componentSERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS

NHTSA's summary

SOME VEHICLES BUILT BETWEEN OCTOBER 1, 1996 AND DECEMBER 31, 1997 WITH AD-9DI OR AD-9I EXTENDED PURGE AIR DRYERS VEHICLES MAY EXPERIENCE A STICKING PURGE VALVE. *YC

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Brakes, Brake hoses and lines

Vehicles listed
PETERBILT PETERBILT1996 to 1997

Listing a model year does not mean every vehicle of it is concerned: the document says which.