I just repaired both lines a few weeks ago. Mine failed just about under the drivers seat. You need to first remove the running boards to gain access to the clips holding the plastic under body panel. The running boards and panels use screws and push in rivets. You will remove about 20 fasteners. The push in rivets appear to be one time only. You have to push the center of the rivet in to release the rivet. If you push the center in too far it falls out and will need to be replaced, I bought 8 new rivets. My lines rusted out just past the couplings in line with the fire wall. One of the couplings is a normal size the other is not. I replaced the odd coupling and about 3' of line on each side. There is allot of room once the panel is removed. The lines clip into brackets along with the fuel lines. You will need a bending tool to match the original routing. For me it was a simple job, but I have done brake lines before. Good luck.

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2009 CLS550
2005 X5
2004 ML350
2002 X5
1998 323ic (sold)
1996 S320 (sold)
1991 190 (sold)
1989 300SE (sold)
1984 SD (sold)
1984 300D (sold)