I have searched for the last hour and only found the below. I went to my parts store and they said all north-american use 3/16" imperial. so I bought 3/16 line and imperial unions to match. I thought I could make the rear driver side and cut and flare it under the door before the rust spot. I spun off the nut and noticed a bubble fitting, so I couldn't use line or unions I bought.
What type of fitting do I need for the rear so I can start there and bend it till reaches the door and then only need to double flair in that spot - one of the threads state you can use the double flair tool to make a bubble double flair? is that true? I found tools that allow you to flair "in line" meaning flaring lines already on the car.
Rear Brake Line Replacement
Brake line thread size?
Brake line repair
What type of fitting do I need for the rear so I can start there and bend it till reaches the door and then only need to double flair in that spot - one of the threads state you can use the double flair tool to make a bubble double flair? is that true? I found tools that allow you to flair "in line" meaning flaring lines already on the car.
Rear Brake Line Replacement
Brake line thread size?
Brake line repair