Usually it starts where the hose is crimped onto the pipe. 2 options:
buy a complete new one from for example www.autohausaz.com
or
find a hydraulic shob which cuts off the old crimp sleeve, separates the the old hose and the steel tube, cuts a new hydraulic hose eaxtly to size, fits on the old pipe which always can be re-used with the connaction and which is actually the expensive part, put on a new crimp sleeve, uses a special crimping press and crimps it = ready to use again.
Some -I would say not so good hydraulic shops - just cut the pipe and connect a prefabricated hydraulic hose again.
Like this one
http://www.bimmerboard.com/forums/posts/87476/
Here is when we made my ones, cut the sleeve, removed old hose etc
http://img50.imageshack.us/my.php?im...lauch136mn.jpg