Check valve retainer not properly seated/fmvss 121
Defect Summary
Blue bird body company (blue bird) is recalling certain 2020-2022 vision and all american school buses. a retainer was not properly seated in the sc-3 single check valve and may not provide source air isolation when pressure is applied. as such, these vehicles fail to comply with the requirements of federal motor vehicle safety standard number 121, "air brake system."
Safety Consequence
Unintended spring brake application may occur, increasing the risk of a crash.
Corrective Action
Dealers will replace the sc-3 check valves, free of charge. owner notification letters were mailed on november 18, 2021. owners may contact blue bird customer service at 1-478-822-2242. blue bird's number for this recall is r21be-sb.
Similar Recalls
Other recalls from Blue Bird Body Company or involving N/A.
FAQ: Recall 21V284000
Your rights, the repair process, and what each field on this page means.
What is recall 21V284000?
NHTSA recall 21V284000 was issued by Blue Bird Body Company on April 22, 2021. It addresses: Check valve retainer not properly seated/fmvss 121. The recall affects approximately 1,634 vehicles, with the defect involving the N/A component.
How do I get this recall repaired?
Contact any authorized Blue Bird Body Company dealer and reference NHTSA recall ID 21V284000 or the manufacturer campaign number R21BE-SB. Under federal law, the repair is completely free regardless of vehicle age or owner history.
Is my vehicle included in this recall?
The only way to confirm is to look up your 17-character VIN at nhtsa.gov/recalls. NHTSA's tool will tell you if VIN-by-VIN this exact recall applies.
How long do I have to get a recall repair done?
There is no expiration on most federal safety recalls. Even if your vehicle is years old and you bought it used, the manufacturer is required to perform the repair at no cost.
Where does the data on this page come from?
All information on this page is sourced directly from the U.S. Department of Transportation public dataset for NHTSA recalls. Last refreshed: 2026-05-22. For the most current official notice, visit nhtsa.gov/recalls.