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I’m pretty certain it’s sealed non serviceable cartridges in brand x posts. I’ve had my 31.6mm one apart and don’t remember seeing any valves or anything.
The cartridges are/were available. You’ll likely have to find a part number and do some searching on that. I thought mine needed a cartridge and it seemed like the 200mm one was out of stock everywhere so I wondered about fitting a 170mm one but then a clean and serviced had it working well again.
They are pretty simple inside so worth stripping it, cleaning everything and regrading to see if it fixes it. I didn’t bother with buying any dropper or dissension specific grease or anything, just used bearing type grease that I already had.
M_V-
They've had a few different versions, you can normally tell which one you have from how the collar looks. I've definitely seen Brand-X and OEM posts from the same factory with a valve.
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Nice I have gone and ordered a new one from my lbs mostly because they're lending me a normal seatpost for a ride I'm doing tomorrow. But I am keen to try and service the one I have. Doing a quick Google it seems the replaceable gas doodads are available online, so I'll just disassemble this one, try and find the part number on it and hopefully have it up and working in a week or two.
A huge shame that the industry seems to want me to just throw this in the bin.
Thanks!
chiroshi
Calumonwheels
Brand x ascent dropper post. Came used with a mountain bike I bought; it goes up and down, but when I sit on the saddle in the locked out position, it bounces, much like a suspension fork/front shock.
Googling around it seems the consensus is that it isn't user serviceable and it's off to landfill especially since I can't return it under warranty.
https://photos.app.goo.gl/WF4J9urP3z4HmVBe7
video of the squish in action. suggestions of what to do outside of buying a new product and throwing this one in the bin welcome.