Help with brake line flare nuts

There’s a damaged part - an OE DIN bubble flare, and an OE line nut. The line nut has squared shoulders of the inner diameter where the flat bottom of the DIN Bubble would sit.

Every single part from manufacturers has that taper in the inner diameter. They all claim to fit my vehicle, all claim to be for European vehicles, etc.

Either the significantly reduced contact area on the flat backside of the bubble flare is irrelevant, or every single part sold anywhere that I’ve looked is wrong.


Well they verified that the bubble flare nuts have the squared inner diameter shoulder. So I fuel I’ll get the right thing…
i see. the profile is not irrelevant imo.

would it leak, probably not, is it correct, no.

good luck. it would seem you are going to have to compromise on something......
 
i see. the profile is not irrelevant imo.

would it leak, probably not, is it correct, no.

good luck. it would seem you are going to have to compromise on something......
No need to compromise. Local part stores suck, they claim parts that aren’t correct.

I fixed the situation by ordering the right parts. Hopefully this weekend I can repair both sides and move on….
 
When I got frustrated with a similar situation I flirted with the Oreilly's guys until they let me in the back and I could paw through their stuff. What I wound up getting was, IIRC, kind of "army green" in color.

This is one of those moments where real life, bricks & mortar beat the internet. You know what you want, and you'll see it when you get it.
 
When I got frustrated with a similar situation I flirted with the Oreilly's guys until they let me in the back and I could paw through their stuff. What I wound up getting was, IIRC, kind of "army green" in color.

This is one of those moments where real life, bricks & mortar beat the internet. You know what you want, and you'll see it when you get it.
Talking about flare nuts got 'em going, eh? Well, it tracks I suppose.....
 
When I got frustrated with a similar situation I flirted with the Oreilly's guys until they let me in the back and I could paw through their stuff. What I wound up getting was, IIRC, kind of "army green" in color.

This is one of those moments where real life, bricks & mortar beat the internet. You know what you want, and you'll see it when you get it.
I did exactly that at AAP. That’s where I saw that all their stuff is wrong, even their premade lines…
 
  • Wow
Reactions: D60
I figure it will, but it’s not right… and it’s brakes.

I figured they combined many part numbers and designs because it’s good enough. Doesn’t mean it is, overthinking or not..
I'm with you in theory. In practice, the metal is soft and smooshes in. It's very possible that taper will form itself when tightened.

Did you receive the correct part? Interested to see how it comes from the factory.
 
I'm with you in theory. In practice, the metal is soft and smooshes in. It's very possible that taper will form itself when tightened.

Did you receive the correct part? Interested to see how it comes from the factory.
I’d suspect that the steel nut is much harder than the tubing. OE tubing looks to be coated steel, but still would bend/conform to a shape - I don’t get that such a situation is desired for the DIN bubble.

I have nicopp coming in the mail to replace. With a SS shield, and supposedly square shoulder DIN flare nuts…
 
Well lookie here…

IMG_3098.webp


FedHill must smoke like a chimney. It smells like the cigar smoking area at the one range I’m a member of.

And yes, they’re squared inner diameter.

IMG_3099.webp
 
Well lookie here…



FedHill must smoke like a chimney. It smells like the cigar smoking area at the one range I’m a member of.

And yes, they’re squared inner diameter.
Nice, I am impressed. If I recall correctly, you first cut the line to the right length, then flare the end, then install the flare nut. Oh wait, dang it!
 
Nice, I am impressed. If I recall correctly, you first cut the line to the right length, then flare the end, then install the flare nut. Oh wait, dang it!
That's what I do. I also crimp on ring terminals then slide the heat shrink on.....

Well I didn’t do either of those things, but I’ll say that too much SS armor that needs to be cut off is a MAJOR pain. Ask me how I know.

IMG_3116.webp
 
Well I got the job done. I got the FedHill nicopp Cunifer tubing made in the UK. Nice stuff. The ML came with coated steel.

I used OE MB unions that they allow per the FSM (one per corner).

Making a DIN flare with the Capri tool is very easy with nicopp. I did have one bad one with the OE steel.

IMG_3102.webp
IMG_3103.webp


Here is the steel flare, the first one was not fully formed and pulled on the clamped down tubing. But after that it was all good.

IMG_3107.webp
IMG_3108.webp
IMG_3112.webp
IMG_3114.webp


It wasn’t hard to form the rest of the nicopp line, though I did mess up lengths relative to curves and had to undo a bit. Took a lot of fitting and re-fitting, but I got it.

IMG_3117.webp
IMG_3118.webp


Because I was using softer nicopp line, I decided to put stainless braid in the exposed area. I made it too long, but the line was just right, couldn’t cut back off. So I had to grind off about four inches of the braid. Took forever. I was almost better off making a new line. So frustrating. Finally I found a cutter for fish hooks that kind of worked.

In the end it all worked out nicely. Bled by gravity and then by pressure.

IMG_3116.webp


My biggest lesson learned is to use an M10x1.0 plug at the ABS manifold, and don’t fiddle with doing work with leaking brake fluid all over. And also cap cut lines…

IMG_3106.webp
 
Nice craftsmanship. Yes, leaking brake fluid getting all over you and your tools is a gross wild card.
 
Just got back from AA again. Nope, they’re all like that too. SURR and AGS branded. Including on all the finished bubble flare lines. They all have the lead in on the nut. Just that slight taper in the ID.

Must be a “good enough for parts consolidation” scenario, for which I’m not a fan. All photos show the squared ID, all the parts at multiple stores show the taper.

Stupid NAPA closes early, but they’re open tomorrow AM, so knocking on wood. Otherwise another week.
In future if you can not find certain things, you may like this company that was started by twin Kryta brothers who restore Olds 442s for fun. They are award winners and have a passion for all sorts of automotive things. Inline tube sells lots of brake related parts , tubing etc.... (nice work by the way(y))

https://www.inlinetube.com/
 
Back
Top Bottom