In case of defect of the air supply or leakage of the air spring the function is taken over by additional spring mechanisms.
Horizontal deflections in this case are taken over by sliding plates on which the air spring plate sinks down.
Vertical suspension as well as partially transverse suspension is taken over by rubber springs acting as additional spring.
The secondary spring system consists of the air spring bellows, an integrated additional and emergency spring and customer/application specific metal parts.