Front suspension
You'll need to check out everything, pump, controller, lines, fittings and struts to find the problem...
And as for what or where to buy, your best bet is the dealer for these items...
You can buy them after market for about 1/4 the cost. The dealer will charge 1000-1500 to replace.
when you go to raise the car get next to the wheel and see if you hear the air leaking out and or do not hear the pump that pumps the air.
Good luck, this is a common prob for cars with airmatic
I took it to local Mercedes dealer I was charged 1600 USD for new front right suspension including labour , they give you a two year warranty , which makes it a little less painful !!! , I could not get the same suspension from any other OEM , ....






