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Service bulletin IB-22-136

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 id11013358
Published by NHTSA2025-02-01
Manufacturer's numberIB-22-136
Manufacturer's date2023-04-13
Campaign id or software versionIB-22-136
NHTSA componentSERVICE BRAKES

NHTSA's summary

Transit bus air compressor inspection to verify if failed compressor is can be repaired or rebuilt.

The document

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

Brakes

Vehicles listed
PROTERRA ZX52021

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