I think that's because the original thick rubber line clamps tight through the hole keeping it in place. The steel line is thinner and could otherwise move around through the big (for a steel line) hole.
The zip's are tied around a steel joint and not around the steel brake line itself.
If you...
I just found this topic on another forum:
http://www.zpost.com/forums/showthread.php?t=836766
Here is the copied post 24 in which they have a solution for the noise he has with H&R suspension, I don't understand where the ball joint is they found loose.
"Update... Took the car to my local...
That was exactly what I was thinking, is it a problem with Bilstein or is it something else?
@ ChawenHalo, Mine also makes the noise with the stock 18" wheels
I can make some pictures how it's fitted front and back, I'm gonna change my 18" Toyo R888 for the 19" Michelin PSS set of wheels later...
Hi Franzino
I have the same noise from my Bilstein B16 PSS10 suspension. I had it fitted 2 weeks ago. I think the noise is both front and back when the suspension is at max extension.
Have you tried something yet?
I also send you a PM in Dutch.