Reconditioning STI System

[Jordan300]

A buddy of mine brought me his 2001 Trek 470 that he just bought and his front derailleur/derailer was stuck. The STI shifter would not release the cable to shift it down. At this point I realized I have no idea how to service these STI systems. PLEASE HELP>
Thanks Guys.

[cyclerUK]

I have had the same problem due to lack of use of the STI.<br />
I just used WD40 squirted into the mechanism. Operated the STI a few times and it freed itself. I then re-lubed it with a thin oil.<br />
It did it a couple of times but has now been O.K. for 12 months.<br />
If you pull the STI brake back, you should see the little hole where the gear cable goes. That's where I injected the WD and oil.<br />
I have never stripped an STI down so don't know if you can service them.<br />
It may be worthwhile fitting a new cable inner to make sure it's not jamming, but you need to get the shifter in No. 1 position to remove the old cable.

[Jordan300]

Yeah that's my issue is that it is stuck in the number two position. The mechanism won't release to shift back down. I will try the WD-40 and I'll report back to see if that works.