Not sure why you need the system to fill to replace the busted bag? I may have missed something in the post. You can jack up the rear axle and replace the problem bag. While I didn't get the message, my bags would not inflate. So I lowered the X just so the wheels touch the ground and set the ride high to the lowest setting, brought it to standard height, then highest setting and back down to standard and all was well.

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2011 E70 50i M Sport