Hazard description
Certain heavy-duty trucks equipped with (IROS) rear air suspensions. During assembly, four bolts and nuts holding the main support member bushing bar pins to the main support member hangers were incorrectly tightened. The nuts could work loose or fall off allowing the bolts to fatigue and fail the connection between a main support member bushing and a main support member frame hanger. Separation of the main support member assembly from the frame mounted hanger bracket could result increasing the risk of sudden loss of control of the vehicle. Correction: Dealers will install four new nuts and bolts and tighten to specification.
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