Issue
Hazard description
Certain school buses do not comply with the requirements of CMVSS 121 - Brake Systems. The rear brake valve module was incorrectly fitted with a standard 90-degree elbow where a 90-degree check valve should have been used. As a result, the rear brake system does not meet the CMVSS bleed down test. In addition, in the event of a catastrophic line failure, the emergency brakes will apply without warning. Correction: Dealers will affect repairs.
Vehicle
BLUE BIRD VISION SCHOOL BUS
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