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bowden cable casing what is the allen head bolt for

828 views 3 replies 2 participants last post by  Benz 1  
#1 · (Edited)
i have the following set up on my bowden cable can anyone please explain why there are vacum lines going to the bowden cable casing.
I had to replace the O ring on the bowden cable casing, there is a allen head bolt on the housing as in the pics which i turned anticlockwise thinking it held down the bowden cable plastic casing but later realised this was not the case , the bowden cable housing actually pulls off
Any ideas please as to what this bolt is for, I assume it has some type of adjustment but just cant find any info, it is from a gen 2 500 sec euro spec but been told the r129 have the same set up
 

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