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Hi, if the rear is dropping you probably have leakage in the rear air springs. Small leaks in the air bellows will cause the car to lower in the rear when it sits for awhile. You will need to get the rear air springs checked for leakage. Both springs should be replaced at the same time due to the amount of work involved. Mercedes sells remanufactured air springs for $706 each. The labor allowance to replace the rear air springs is 7.5 hours. A leak at the lines or at the suspension valve block is also a possibility but leakage at the rear air springs is the most likely problem.
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