If you want to learn more about your X5, there's some great reading here.

Added the following links to the first post (download section):

BMW Suspensions & Alignment (Thanks katit)

X5 Pre-facelift Overview & Repairs/Adjustments (Thanks katit)

X5 Central Body Electronics - ZKE III (Thanks katit)

X5 Central Body Electronics - ZKE III #2 (Thanks katit)

X5 Self-Level & Air Suspension - EHC I (Thanks katit)

X5 Two Axle Air Suspension - EHC II (Thanks katit)

X5 Climate Control Systems - IHKA/IHKR (Thanks katit)

X5 Dynamic Stability Control Overview (Thanks katit)

X5 Dynamic Stability Control - DSC III (Thanks katit)

Plenty more to upload later ... Thanks katit!