what is the 3rd brake line for?

[Rockhoundrob1]

I am changing the master brake cylinder. All other ones I have done only has 2 lines.

The one I am putting on a 1989 240SX has 3. What is the 3rd one for?

and where does it go?

[Rockhoundrob1]

Never mind... I lost track of the lines. 2 goes to the front (one to each side) and the "3rd line" goes to the back.

I wasn't looking close and got the fuel line mixed over when I was following the lines.

[Crania]

Get or make new lines. Mount new clamps in new positions and have fun driving your truck. No need to spend so much time and effort to reuse original pipe clamps or mounting points.

By the way my new auto-mech project - customrigsmag (https://customrigsmag.com/)