The car has a hydraulic system. I can get the system to inflat the rear suspension by pushing a button, however there is a slow leak. Thanks for the tip, I will look under the hood for the hydraulic oil reservoir/tank and try to trace the lines. Being new to the Mercedes family I am not an expert yet on all of the "in's and out's". So, if anyone lives near Grand Rapids, Michigan and can recommend an honest, trustworthy mechanic to work on my new ride let me know!