Thanks for all info!  It may be a while but I will let you know the outcome.




> On Sep 11, 2019, at 1:06 PM, Meade Dillon via Mercedes 
> <mercedes@okiebenz.com> wrote:
> 
> Concur with all the answers regarding the control valve, but if your SLS
> pump cannot rebuild pressure within a couple minutes of running, your pump
> may also be weak and needs to be either rebuilt or replaced.
> 
> A good check for the health of the control valve: After engine shut-down
> (assuming the rear suspension height is correct / pumped up to normal)
> check the reservoir under the hood, and observe if the return line is
> dripping.  Some dripping will be normal, but if it keeps on dripping a
> steady drip, the base pressure valve has failed and that is why the rear
> end leaks down and sags.  On my euro '85 wagon, I could watch through the
> reservoir lid for the dripping, but on US models and other years, I think
> the reservoir is different so you may need to remove the line so you can
> let it drip into a cup or something.
> -------------
> Max
> Charleston SC
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