Brake upgrade?

[Deutsch]

Hi my CLK has corroded rear brake lines - was going to re line the full car with copper lines, this is not a problem however one of my front calipers has a cut piston rubber which is causing a little corrosion on the piston causing it to be sticky.
The questions are
Is there an economical brake caliper upgrade
Has anyone fitted stainless flexi pipes and know of good suppliers for the same.
Thanks

 

[flango]

Replaced all my lines with Cupro- Nickel pipe of which the Kunifer brand is probably the best known, this has burst pressures some 60% higher than copper pipe. I also replaced the flexi's with goodridge stainless steel braided ones again higher burst pressure rated. Plenty available on the net or e bay just google Kunifer & Goodridge

If you struggle give me a shout and I'll try and point you in the right direction