Rear brake line help
You can unwind the spring like external protector a couple inches.
Then with a tubing cutter make a clean cut.
Get a double fairing tool kit and some double flare nuts or buy a pre made double flare tube and cut it to get the nuts.
PRACTICE PRACTICE PRACTICE using the double flare tool to make good clean flares on scrap tube.
Then put the new end on.
Now the line will be shorter so you will have to find a longer flex hose and or reroute the mounting to fit propperly.
I'm sure you can find YouTube videos on using a double flare tool