Been using Copper Nickel brake lines, for over a decade now / just had some put on my '98 Silverado.

- the garage I use, its all they install / sourced from NAPA-UAP

Sold our 2002 Volvo v70 with 297,xxx Km (2 years ago) and the wagon easily passed the safety check.

- it had NiCopp® lines from the Factory, mint lines & never garaged

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AAS Copper Nickel Line CN-516 5/16" X 25'
https://www.amazon.com/AAS-Copper-Nickel-Line-CN-516/dp/B00AEUNJ6S
5.0 out of 5 stars 6 customer reviews
Price: $54.99 & FREE Shipping
88% Copper, 10% Nickel, 2% Iron
Extremely Pliable, Easy Flaring and Bending
Will Not Rust
5/16" X 25'

http://agscompany.com/product/nicopp-nickelcopper-brakefueltransmission-line-tubing-coil-516-x-25/
5/16 X 25 Copper/Nickel/Iron Alloy Tubing Use to fabricate 5/16 fuel and transmission lines. When combined with tube nuts and flaring tool, coils are an economical solution for shops that want to build their own lines, custom lengths or non-standard applications. NiCopp® is a nickel-copper alloy brake tubing that meets SAE Standard J1047 and ISO 4038; meeting all international and U.S. requirements for brake tubing. This alloy is approximately 9.2% nickel, 1.4% iron, 0.8% manganese, and 88.6% copper. Under the UNS system, this alloy is designated as UNS C70600. NiCopp® therefore has the strength and structural integrity of steel lines but with the added benefit of being much more corrosion resistant. NiCopp® is also easier to bend and form than steel tubing. Nickel-copper, commonly referred to as 90-10 copper, has been used on several European vehicle brake systems since the 1970s, including: Volvo, Audi, Porsche, and Aston Martin. NiCopp® has been used on hydraulic/fluid transfer systems on vehicles where steel lines and tubing are commonly used. This includes brake, fuel and transmission systems. NiCopp® is considered the super-premium brand in brake lines and should be considered where the underbody of the vehicle is subjected to the harshest environments, where the longest life-span for lines is required, and/or where direct OEM replacement is desired. NiCopp® Does Not Rust or Corrode DOT Approved for Hydraulic Brake Systems Bends 58% Easier than Steel Tubing Available in Coils of 25, 50, and 100

4 REASONS TO USE CUNIFER COPPER NICKEL BRAKE LINE

http://www.brakeconnect.com/4-reasons-to-use-cunifer-copper-nickel-brake-line 
Cunifer or Copper Nickel line is a new way to make brake lines that has actually been around for many years. In fact its first commercial use dates back to the 70s!

In this post Im going to convince you why cunifer copper nickel line is the right choice for ANY vehicle and definitely the easiest replacement available for the shop or shade tree mechanic.


1. Cunifer copper nickel brake line is super flexible.

In fact in most cases you wont even need tools (although having a pair of brake line pliers can make tight bends easier). This is ESSENTIAL when routing complicated line paths from the engine compartment to the rear wheels. If you are thinking of replacing the longer lines to the rear of your vehicle you will be working very hard if you dont use conifer copper nickel brake line.

2. Cunifer copper nickel brake line is corrosion resistant on the outside

The exposed conifer copper nickel brake line is still 88.7% copper. This means that all the road salt and grime you pick up in the winter is ineffective at rusting the outside of the tube. Normal steel brake line is coated in a corrosion resistant material. If this material fades or is scratched the plain steel line underneath is exposed and WILL RUST

3. Cunifer copper nickel brake line is corrosion resistant on the INSIDE

One major thing people dont realize about brake systems is that even DOT 3 or 4 brake fluid will absorb ambient moisture and hold it in suspension. Inside those steel brake lines there is no epoxy or zinc alloy coating to protect your lines. As they rust the material is carried around and collects in the important parts of your brake system.

In contrast conifer copper nickel line is MADE OF 88.7% COPPER. This means that inside and out the protection is the same.

4. Cunifer copper nickel brake line is soft

When it comes time to make brake line fitting connections you will need to flare the end of the tube. If you use a professional tool like our high speed flaring kit this point isnt that important because it works well on any type of tube. However if you have one of the wingnut style readily available cheap tools you are in for a real hard time if you are using steel tube. But not so with conifer copper nickel tube. End forms and flares are easy with such a soft material and you will really enjoy making them instead of cursing.