Fork bleed

[MonsieurMoto]

Hi, as a new member not sure how this goes but I'll give it a bash

Has anyone out there rebuilt the telelever forks for an BMW 1150GS? My question is, once the forks have been assembled, you have to bleed them to remove the air trapped inside. My workshop manual (Clymer) instructs me to slowly compress and extend the forks with the airbleed screw removed in order to expel the air. After doing this several times, if you fully compress the forks and fit the air bleed screw, extending the forks creates a vacum inside as the volume inside the forks increases. This means that the forks are very hard to extend as they want to keep retracting. Conversely if you extend the forks and fit the bleed screw and then try to compress the forks, the forks push back as you're compressing the air inside.

When fitting the bleed screw, what position does the fork leg need to be relative to the slider? I picked a arbitrary figure of 150mm extended as a position - this equates approximately to half way between fully compressed and fully extended.

Don't know if this is correct, any suggestions/information would be useful.

 

[JohnnyBoxer]

A mod needs to move to the 1150 section, to help the OP out

 

[Mr K]

mr badger to the spangly Mod' phone!

 

[Paul G (BHT)]

.... Don't know if this is correct, any suggestions/information would be useful.

The answer you're looking for can be found in THIS post

 

[Comfy Old Boots]

I'll have a look later when I'm on a proper computer for a link but as I remember it, take the bleed screw out and extend the tube to the height that you want it at. Then before you put the stanchion into the headstock, reinstall the bleed screw and just pop the stanchion into the headstock and do the other side. Steptoe had a good link here somewhere. Hth

 

[Paul G (BHT)]

.... Steptoe had a good link here somewhere. Hth

If you have a spare 10 minutes today, I'd pop down to Spec Savers if I was you

 

[MonsieurMoto]

Taa for the advice - especially Steptoe's link. All I need to do now is to find out where I put the bleed screws!