Hi, I have a Merecedes Benz ML500, both front air bellows have been replaced in the past two years. recently the front passenger suspension has started lowering again, however when I raise the suspension to level 2 the suspension does not lower even over an extended period. Have you come accross this before?

I would like to fix the problem without being overcharged by the agents.



Not this particular issue but I would check the level sensors at the front air bags. 

Valve block could be the problem but I think it is less likely. 

Do you have star diagnostics scanner? 

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