Rear Air Suspension - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 07-15-2019, 07:05 PM Thread Starter
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Rear Air Suspension

All,
I need a little help diagnosing the air suspension on my 04' E320 base wagon. I only have air suspension for the rear. I had the light that the car was "TOO LOW" come on in red and it got to the point that it would not pump up. I found that the pump had a broken hose and was full of water. Replaced the pump and it pumped up and stayed up until I drove it. It now seems to have two positions that it likes to sit. When I start the car the pump comes on and it pumps up and sits at ~26" from the top of the wheel arch to the ground (looks good). The other position is at ~24". This is usually after it's been driven at bit. If it's at 24" and I stop and restart the car it will rise up to 26" and stay there until driven again. The red "Too Low" light has never come on since I replaced the pump. I don't believe the air bags are leaking as it stays up. But the behavior doesn't seem right. Does it depressurize when stopped? Any help would be appreciated.

Thanks
Paul
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post #2 of 5 (permalink) Old 07-16-2019, 06:49 AM
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Revisit compressor install per attachment. If you have not already done so replace air filter. Check for leaks. No leaks problem persists, since water was found you may need to blow out air lines with compressed air note however, if system does not recover itself afterward STAR may be required to discharge/recharge.
Attached Files
File Type: pdf compressor.pdf (198.9 KB, 14 views)
File Type: pdf leaks.pdf (340.0 KB, 14 views)
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post #3 of 5 (permalink) Old 07-16-2019, 08:31 AM
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Originally Posted by PMarrack View Post
All,
I need a little help diagnosing the air suspension on my 04' E320 base wagon. I only have air suspension for the rear. I had the light that the car was "TOO LOW" come on in red and it got to the point that it would not pump up. I found that the pump had a broken hose and was full of water. Replaced the pump and it pumped up and stayed up until I drove it. It now seems to have two positions that it likes to sit. When I start the car the pump comes on and it pumps up and sits at ~26" from the top of the wheel arch to the ground (looks good). The other position is at ~24". This is usually after it's been driven at bit. If it's at 24" and I stop and restart the car it will rise up to 26" and stay there until driven again. The red "Too Low" light has never come on since I replaced the pump. I don't believe the air bags are leaking as it stays up. But the behavior doesn't seem right. Does it depressurize when stopped? Any help would be appreciated.

Thanks
Paul
You do have a leak but it's a slow leak.
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post #4 of 5 (permalink) Old 07-17-2019, 05:03 PM Thread Starter
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Thanks to both for the replies and the files of where to look. I'll check for leaks. Although, I'm still puzzled that it only leaks when driven and to the same height.

Paul
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post #5 of 5 (permalink) Old 07-20-2019, 05:50 AM
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Our wagon depressurizes/lowers slightly via automatic solenoid activations in both the front and rear when it is turned off. Kinda cool if you ask me. The rear Arnott replacement air springs do not appear to have as much ride height adjustment as the factory units did IMO.
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