I have had the air bladder leak and if yours is leaking you will notice the X5 sitting low in the morning. You can't hear the air pump working as its buried under the spare tire. Also you will get a fault light if your air suspension is not working properly. By the way I had both bladders replaced for around $850 at the dealer. I can't imagine what the rough ride could mean, are one of the rear shocks leaking?

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2013 X5 3.5i M Sport
2004 M3 cabriolet SMG