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Service bulletins for the 2021 New Flyer Xcelsior

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.

7 on file from NHTSA, as of 2026-10-19.

By type

By component

Bulletins, newest first
TSIB 26-082026-08-12. Service bulletin. SERVICE BRAKES. This bulletin introduces new improved banjo bolts for buses equipped with a Haldex tandem air dryers. The updated banjo bolts feature enhanced corrosion resistance and are designed to replace the current banjo bolts to help minimize corrosion-related issues that may affect air dryer performance and reliability.
TSIB 26-062026-05-14. Service bulletin. ELECTRICAL SYSTEM. Bulletin to follow when replacing LV batteries on buses equipped with certain Vanner battery equalizers.
TSIB 22-072022-09-02. Service bulletin. SERVICE BRAKES, AIR. This Technical Service Information Bulletin (TSIB) - New Flyer has developed several maintenance updates for Xcelsior buses specifically equipped with the optional Powerex electric air compressors. This TSIB introduces field modifications in order to simplify maintenance operations and/or improve compressor longevity
SMB1942021-06-03. Service bulletin. SUSPENSION. This service manual bulletin is an update to the 6,000 mile Preventative Maintenance inspection and lubrication requirements for the front stabilizer bar on all Xcelsior model buses.
TSIB 21-032021-05-06. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Technical Service Information Bulletin revising the lubrication schedule for the scroll bearing on specifically equipped vehicles with the Powerex direct drive electric air compressor.
TSIB 21-022021-05-06. Service bulletin. ENGINE AND ENGINE COOLING. Technical Services Information Bulletin describing how to inspect specifically equipped vehicles, for possible pinch points on the Modine radiator fan harness routing.
SMB1952021-05-06. Service bulletin. ELECTRICAL SYSTEM. This Service Manual Bulletin provides additional information regarding the 6,000 mile Preventative Maintenance requirements for the low voltage battery system.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.