I installed all new hard lines and clips on my 603 last year. The old ones were worn where the clips were missing and the lines had rubbed against various surfaces. I've had hard line breaks before on a 603 and thought it time to preemptively change them. They are expensive and not all that easy to source. Ebay + dealer in my case. Tricky bit is fitting the new clips - lining up the new hard lines and making it all fit together.

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DS
2010 CL550 - Heaven help me but it's beautiful
87 300D a labor of love
11 GLK 350 So far, so good
08 E350 4matic, Love it.
99 E320 too rusted, sold
87 260E Donated to Newgate School
www.Newgateschool.org - check it out.
12 Ford Escape, sold, forgotten
87 300D, sold, what a mistake
06 Passat 2.0T, PITA, sold

Las Vegas NV