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Service bulletin S20AT

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 id10182701
Published by NHTSA2020-11-23
Manufacturer's numberS20AT
Manufacturer's date2020-11-09
NHTSA componentEQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; SERVICE BRAKES

NHTSA's summary

Overview: Certain buses built with SmartTrac Hydraulic Anti-lock Brakes (ABS) may have dual fuse block 10041668 assembled incorrectly, causing the ABS fault lamp to illuminate. The Dealer is to inspect and verify the correct assembly of dual fuse block 10041668, per the enclosed instructions and correct as required. Affected Units: Certain model year 2021 Blue Bird Vision School Buses Manufactured from December 12, 2019 through March 7, 2020 Repair Parts: No additional parts/items are required to perform Service Bulletin S20AT. Time Allowance: Time allowed to inspect and install the lock washer under the nut as designed is 0.1 hours (6 minutes). Completion Notification: If you perform this service bulletin yourself or have an outside repair facility perform this bulletin, please notify your Blue Bird Dealer, when the repair is completed. If you request reimbursement for labor, also send a copy of the work order/invoice to your Blue Bird Dealer. If the modification directed by this notification was performed on your unit prior to the receipt of this notification, you may be eligible to receive reimbursement for the cost of obtaining a pre-notification remedy of the subject matter of the campaign. Please provide a copy of all receipts to campaignparts@blue-bird.com Bulletin Duration: This Service Bulletin ends one (1) year from date of issue. Repair Facility: We encourage you to contact your Blue Bird Dealer to arrange to have this Service Bulletin performed. You may elect and have the option to perform this Service Bulletin yourself or have a qualified repair facility convenient to you perform this work. A qualified technician must perform work required under this bulletin and corrected according to the enclosed instructions.

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, Equipment and accessories

Vehicles listed
BLUE BIRD VISION SCHOOL BUS2021

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