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I had a brand x ascent dropper that stated getting a bit sticky going up and down. In the end it fixed itself with a bit of time and some silicone spray.
But before it did I looked into stripping it down and servicing it and it didn’t look too hard. There are videos on YouTube.
Though I’ve no idea if that would help fix your issue. -
Two options. First, the cartridge may have a Schrader valve on the top underneath the saddle clamp. Stick a shock pump on it and check the pressure is good. Second option is it's a sealed cartridge, which you should be able to replace. Brand X (Trans-x) make dropper posts for a lot of brands, so the cartridge might be searchable under another name. You might have to pull out the cartridge to get the code before finding the correct replacement though.
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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.
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Samuelson
chiroshi
M_V
@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.