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My Reverb is just under a year old, so still in warranty. It's started to drop about half an inch when I put weight in it. I spoke to the shop I bought it from, and they suggested bleeding it, which I did, not really expecting much change. The bleed seems to have almost cured the problem - it now only drops a couple of mil. Worth trying again with the bleeding or is it masking something more serious?
Have you checked the pressure? Sounds like it could need topping up (250psi from memory)
the ifp seals have gone and fluid is getting into the air chamber .
i bet if you let all the air out there will be some fluid in it .
the seals need changing , and if it is still under warranty do it now .
the problem will come back .
The instructions on my Reverb tell me not to touch the air pressure otherwise I invalidate the warranty and cause a complete service to be required, with likely death occurring imminently...
The half an inch drop seem to be a problem which will get you a no questions asked warranty replacement. You could spend money on a service and repair yourself if your prefer to save a few week seatpostless wait.
I've had two replaced after a years use due to this issue. It's worth Bleeding (which you've done) and checking pressure is at 250psi first though.
It's only a couple of mm drop now after lots of bleeding, but I can't get rid of that. I have checked the pressure aye, first thing I did