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Joplin 4 - Replaceble valve core?

paulboxpaulbox Posts: 1,203
edited March 2014 in MTB workshop & tech
So, I'm the bloke who is still running an old Crank Bros. dropper post... :oops:

I actually quite like it when it's working, but it hasn't been working for a while. I think the problem is that the valve at the base of the post is leaking. When I pump it up correctly it works a treat, but only for a short while before it reverts to its lazy "won't go up on my own" attitude.

It holds me up fine and drops when I ask it too, but will only go up when I manually pull the seat up. This is fine on a flat section, but when riding somewhere like Llandegla where you switch quickly between fast rough descents and nasty little climbs, it is a bit tricky.

Anybody else had and fixed this problem? Can I replace the valve core? Or does it sound like something completely different to you?

Cheers, Paul.
XC: Giant Anthem X
Fun: Yeti SB66
Road: Litespeed C1, Cannondale Supersix Evo, Cervelo R5
Trainer: Bianchi via Nirone
Hack: GT hardtail with Schwalbe City Jets
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