Date registered: Jul 2006
Vehicle: 2005 E500S4
Location: Bowie, MD
Mentioned: 0 Post(s)
Quoted: 3 Post(s)
I have been watching this topic for a while now anticipating the time when mine will fail as well. I have 124K miles and all is good so far. From what I read it seems there are two failure points: one is a solenoid and the other is a leaky connection point in the lines. The solenoid failure showed itself by only leaking air under certain conditions namely going over a certain speed. I think it was 45mph if he stayed under that limit the rears would not deflate but if he went over that limit they would deflate overnight. Under 45 he could drive it for two weeks and always stayed up. No conclusive diagnosis as the solenoids are not replaceable, had to go with new bags, etc. The other failure seems to occur at the reservoir tank in the backend. Listers were showing photos of a barbed connection with a lot of corrosion. The corrosion was allowing leakage. I have considered going in and cleaning up and maybe some silicone seal to head this corrosion off but I have been too lazy. This is the first place I am going to look when mine starts. My first repair attempt will be to remove rubber hoses from reservoir tank clean up connection, apply some silicone seal and use a stainless steel hose clamp to seal it all up again. I would check the connections at the reservoir first.
2005 E500S4 Everything except Distronic and Heated Steering Wheel. "87" Porsche 928S4, "87" Porsche 944
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