Double Flare Or Single Flare In Brake Lines

I’m starting to re do some of the brake lines and replace the master cylinder on my 69 cj5. My question is would you Guys suggest a single flare or double flare on the brake lines.I know in years past I have single flared many brake lines with no problem. Also should I make a few “coils” in the lines between the master cylinder and the distribution block?

 

Double

 

The coils are to allow movement and flex between a body/firewall mounted MC and frame mounted brake lines. A 69 should have a frame mounted MC (if original), this makes the coils unnecessary as it is all mounted to the frame.

 

Yes, but false logic.
The single-flare guys who did have a problem aren't here to tell us about it.

Double flaring is not that hard. With a very basic hand tool I can do a double flare in four minutes.

 

Double flare. Blow some coin and get a quality flare tool.

 

Thanks for the advice guys!Double flare it is I bought one today

 

Preparation of the line is key. Bad prep=bad flare.

 

Yes. Especially chamfering both ID and OD.