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^^^My vote is prebent & flared stainless. Never worried about kinking, rusting, or blowouts in my plow truck once I upgrade.
I had substantial trouble flaring NiCopp in 3/16 size--the only size I've worked with.
Other folks seem to have no trouble with NiCopp; and I can flare double-wall seamless steel tubing with little trouble.
I never did figure out what I was doing wrong. I also haven't been trying to gain experience with it, although I should.
Nickle-Copper brake tubing (Making flares)
Finally got back to the rear brake job on my '97 K2500. I've had the truck almost five years, but only about a thousand miles in that time. Truck is full of neglect. I'm dealing with each issue, but not rapidly. I figured the shoes would be totaled; right on the rivets. Figured the drums...www.gmt400.com
I've never worked with stainless brake tubing. I've heard it's tough to get the flares to seal--the material is hard and doesn't conform well. Some folks have recommended specialized copper flared sealing washers for use with stainless tubing flares.