Brake front to back tubing
 

I give up. I want to replace the hard tubing on my ‘86 Sport. I’ve looked on line and, not surprising, I can’t find anything that is oem.
Has anyone done this and if so I’d like to hear about how it was done.
I appreciate any help.

This is not the correct section for questions, but that's okay. I'm sure a mod can move the thread to the appropriate section.

The tubing comes from the master cylinder. The one that goes to the back comes from the big block next to the cylinder, and goes along the drivers frame rail to a splitter near the rear drivers wheel well. From there, it splits one to each wheel well.

The one from the master cylinder to the rear is available from the dealer, as I just purchased one a few months ago. I (and others, from searching online) believe it is designed for the Right-Hand Drive variant of Rx-7, but it still works. The only thing is that under the car the tube has a strange bend. If that's all you need, you're good to go. The ones that go from the splitter to the wheel, however, are NLA from Mazda.

If you also need the ones that are at the rear, I would buy a tuning bender and some lengths of generic tubing at the local automotive store, measure and bend the line myself. It's pretty cheap, and that's what I did myself a few weeks ago. The splitter is available on Amazon.

The tubing is metric, I believe M10x1.5 with a 3/16" diameter tube and a double flare. If I recall correctly, that is.

Tubing is 3/16, flare nuts are M10x1.0 inverted flare and you are correct for the double flare type. Remaking brake lines is time consuming but overall pretty easy with copper/nickel hard lines. They wont rust and are easy to shape too. Good luck with the replacement of the lines, it reminds me that I have to do mines too.

Perhaps slightly off topic, but might be useful info for the OP as well: do you have a part number for proportioning valve to rear tee hard line? The online catalogs I've found don't have it listed anywhere I can find.

Thanks!