Service bulletin 551332

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.

NHTSA's summary

The add on component separates the tail light signal from an actual brake signal so the customers no longer need to mess with their brake controller when towing as the Freightliner M2 Chassis applies brake signal to the four-way flashers, which in turn will activate the brakes of a towed item, such as a trailer. In some states, it is required to activate the vehicle four-way flashers on certain Grades.

The document

• NHTSA's copy of the document (PDF)
• If that address does not open, try this one

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Lighting

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

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