Brake unions

[FDLWproject]

Anyone happen to know what size these brake line connections are that come with the kit? I’m switching to braided lines and want to be sure I get the right fittings.

Think it’s part 25507.

195707

[Jryasko]

They are -3 inverted flare 3/8 x 24tpi

[FDLWproject]

They are -3 inverted flare 3/8 x 24tpi

Thanks!

And to future friends who may find this post and be interested on converting to braided lines, here is a summary of what I did in case it helps. There may be an easier way, but I was trying to stick with Earls/Fragola as much as possible and was limited a bit by the braided line sizes that are offered. If someone thinks I'm about to make a terrible mistake, I'm all ears!

195860195863

[BRRT]

A few observations:
1.) The hydraulic clutch line is often -4. A greater need for flow than a disc brake system. I don't know about your system, so my statement may not be accurate.
2.) If you aren't committed to those brands, you may be able to save a few bucks at Pegasus Racing.
3.) If you are using production-based front brakes, the FFR provided front brake hoses have the proper banjo fitting on one end and a -3AN on the other.
4.) Think hard about putting a 90 degree bulkhead in the floor of the footbox for the rear brake run. Tubing really shouldn't pass thru panels without using bulkhead fittings. Especially true if you are using NiCopp.
5.) The fitting you inquired about initially is for a 45 degree double flare. The list of fittings you put together is 37 degree AN. The two are not compatible.

[FDLWproject]

A few observations:
1.) The hydraulic clutch line is often -4. A greater need for flow than a disc brake system. I don't know about your system, so my statement may not be accurate.
2.) If you aren't committed to those brands, you may be able to save a few bucks at Pegasus Racing.
3.) If you are using production-based front brakes, the FFR provided front brake hoses have the proper banjo fitting on one end and a -3AN on the other.
4.) Think hard about putting a 90 degree bulkhead in the floor of the footbox for the rear brake run. Tubing really shouldn't pass thru panels without using bulkhead fittings. Especially true if you are using NiCopp.
5.) The fitting you inquired about initially is for a 45 degree double flare. The list of fittings you put together is 37 degree AN. The two are not compatible.


Thank you for the input!

1) I don't have details on my hydraulic clutch yet. It's coming from Forte at some point, but I'll wait to assemble anything on the MC/reservoirs until I have it in hand.
2) I'll check out Pegasus
3) I've got the wilwoods hooked up already and no issues on that side of the brake setup
4) I had debated on the 90 degree bulkhead. Was at least planning to do a grommet, but would something like this work well you think?

195907

5) I've had a lot of trouble getting these connections ironed out, so thanks for catching that. My understanding is that the brake union is #7900 (here (https://www.eaton.com/ecm/groups/public/@pub/@eaton/@hyd/documents/content/pll_1015.pdf)). Those indicate 3/8-24 on all 3 sides. My hope was that a 3/8-24 male -> -3AN coupler would work. Any idea on couplers/unions that I could use to get the -3AN hoses hooked up using a tee joint?

Thanks!

[BRRT]

1.) I have a Forte clutch master/slave on the way, so no personal experience yet. Mike told me his setup comes with a new master cylinder, hose, and all plumbing.

4.) That Fragola fitting is aluminum. While some have used aluminum AN fittings, it's generally considered best practice to use steel or stainless fittings for brakes. I used aluminum fittings in my fuel system.
5.) Yes, the thread matches, however, the thread is not what seals. The sealing function is provided by the metal-to-metal contact at the taper junction. 37 degree fittings will thread into 45 degree fittings, but they will leak like a showerhead when you put fluid in.

Please read Mike Bray's excellent post on AN fittings here: https://thefactoryfiveforum.com/showthread.php?45694-Stainless-Steel-AN-Brake-Lines
Mike knows about tube and fittings.

I am FAR from an expert on such things, but I just completed my brake system and (thank god) had no leaks. Check out my build thread starting with post 48 (page 2) for a few pictures of what I did.
It was very much a learning experience on bending and flaring.

Most guys pick 1 fitting technology, 45 degree SAE double flare or 37 degree AN, and follow it all the way through the brake system. It avoids confusion. You don't want confusion.
I went with AN due to engineering experience with AN fittings in high pressure industrial hydraulic systems.

[BRRT]

Here is a partial list of the brake tube fittings I used in my system. These are from Pegasus Racing. I also used various fittings from Summit, and NiCopp 3/16 tube to tie it all together. Tubing sourced from Federal Hill Trading. Good stuff, easy to bend and flare.

https://thefactoryfiveforum.com/attachment.php?attachmentid=195909&d=1708629489

Please do not take this as gospel as to what you should use in your system. Educate yourself and make your own decisions.

[FDLWproject]

Thanks Jeff! This was super helpful. Good luck with your build!