Failure Analysis Unless pre-mature failure occurs, Air Springs typical performance life is 7-9 years. The following outline causes of premature failure: Freightliner Century Class ST Cab Air Spring Issue OEM # Firestone Goodyear Change of cab air spring18-40977-000 superseded by 18-52651-000W02-358-7207 superseded by W02-358-72151S5-175 W02-358-7215 replaced W02-358-7207. Due to proximity of the cab air springRead more