- Bleedin’ reverb …. (see what I did there?)
My ancient, unloved and un-serviced reverb (non stealth) got stuck half way up.
I’ve now tinkered and it’s stuck all the way down (fiddled with pressure).
I have a bleed kit but am unsure as to what to do as instructions say the post needs to be fully extended before servicing.
Any handy hints or tips?
ThanksPosted 1 month agophiljuniorMember
I would bleed it in situ, but be prepared for extension/mess to ensue. You could even possibly put the syringe on the lever end first and see if it’ll pressurise enough to get the thing up before you connect the post end.
The bleed process is fairly straightforward in itself, and did the job very effectively on my post that had got a bit sluggish in the cold weather.Posted 1 month agoDavesportSubscriber
The obvious thing that springs to mind is the the button isn’t moving the poppet valve far enough/at all. Adjusting the return speed to max and see if anything happens. IE you can get the post to extend again. The speed adjuster increases/reduces the oil volume going to the poppet. If this fails you can bleed the hydraulic line with the post depressed but be aware that if the post is in a stuck down condition it may release at some point. There’s a lot of stored pressure in these posts so take appropriate precautions.
Might also be worth taking the post out and see if there’s anything leaking out. The other thing that can happen is that the circlip completely corrodes away allowing the innards of the post to drop down. Easy one to spot.
D.Posted 1 month agorichmtbSubscriber
I’ve just repaired a reverb where the circlip had failed.
I give it a minor rebuild – removed the outer post and collar and gave everything a clean and put it back together.
When I re-pressurised the air spring it sucked down to about half extension, but it popped back up when I bled it. I doubled check the pressure and after that it was good to go.
Bleeding them is really easy. Turn the speed adjuster on the lever to slow. If your post is stuck down then bleed both ends. Cycle the oil back and forth a couple of times until the oil is free of bubbles. Then disconnect the seat post end. Cycle the speed adjuster back and forth a couple of times and press the lever a couple of times to make sure the lever is free of any trapped bubbles then disconnect the lever end. DonePosted 1 month agophiljuniorMember
Would it be a bad idea to just let all the air out and suspend the bike by the saddle so the post is extended?
This would be a very bad idea. Best case you’d be pulling a cavity on the oil side of the gubbins. Worst case you’ll pull a whole load of air past the IFP, and need a full strip down to sort it.
I would probably just do it with the seatpost half up. As someone else said it’s only the poppet valve you need to do to get it moving again. (I mean, the rest of the seatpost might be in need of a service too, but this will get it working for now)Posted 1 month ago
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