my S500 4matic airmatic shock seystm on the driverside front and back seem to always be lower than the passenger side , the pump works but for some reason both shocks on the left side(driver side ) dont rise all the way and they do hold the pressure . can someone tell me what could be the problem. Also I replacd the rotors and brake pads on the front original equipment and since then every time I hard break there is a rubbing squeky noise that comes from the passenger side only. I switched the rotors around and still the noise comes from the passenger side only when I hard break. any suggestions.

 

You have indeed a bad front passenger strut!
I know because my symptoms were IDENTICAL!