Copper pipe that is specifically made for automotive brake line use are a copper-nickel alloy, are seamless, won't work harden, have a tensile strength and pressure resistance equal to that of steel lines. Steel brake lines once they start to corrode the tensile strength and pressure resistance drops dramatically.
Most brake places, Repco etc can supply copper alloy brake lines pre-made to specific lengths.
There are a number of automotive manufacturers that use copper-alloy lines in production vehicles, Rolls Royce, Volvo are two.
EDIT:
Also note in QLD, Queensland Transport,
[1] Normal commercial copper tubing has been prohibited from use in brake systems because it is considered prone to cracking due to work hardening. However, there is a Society of Automotive Engineers (SAE) Recommended Practice called Tubing - Motor Vehicle Brake Tubing Hydraulic - SAE J1047 which is the accepted industry standard. Persons wishing to use copper tube for vehicle hydraulic brake lines, must first provide proof of compliance with SAE J1047or equivalent standard.
[2] Made up hoses are not acceptable. Where brake hoses are replaced with aftermarket products, relevant standards approval marking is required. Motorcycles manufactured on or after 1 July, 1975, the brake hoses must be marked as per ADR 7/00. (Made up hoses are not acceptable unless specifically approved.) Braided hoses are acceptable provided they are approved and correctly marked. Refer AIS Information Sheet 7 - Braided Brake Hoses.
Best regards
DarrenR


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