Whats this on my brakes?

[Foxy-jim]

Hi guys,

Started to take apart my rear beam today so that I can do a refurb on it. Going fairly well at the moment. I got to the point of using the slide hammer to release the drivers side trailing arm from the beam and tried to pull it all the wau out, but realised there was a black cable going to the to of the rear caliper.

It isnt the brake line or the handbrake cable as I know what these look like. But it was fixed in with what looked like an allen key bolt. If I knew what it was I would have just removed it, but I just wanted to check that it was before I do this. This is the only think holding me back really from getting it all finished!

Heres a pic...


Thanks in advance