flare type-brake line to brake line?

[hammer2]

I had two rusted lines on my brakes. both of the lines that go to rear were rusted with pinholes in about same location where they go up near driver rear wheel well. One was short piece about 2' long that had bubble flares on each end with Male threaded connectors. replace that one when I was testing it I found other one was also bad. But it had to be cut out. at this joint I will put bubble flare on each end (new line and existing line that I left in place)with male threaded connectors. then use a connector that has female theads on each side to join the old with the new. The question is about the other end of this spliced piece. The original setup had the line coming from front (ABS) with a bubble flare and male threaded connector. It joined directly with the piece that then goes to passenger rear wheel. that piece has a female threaded connector. but the flare has me puzzled? it doesn't look like bubble. it goes IN, like a double inverted. but when compared to a known double inverted, it doesn't seem like right angle. is it likely just a bubble that has crushed in during the mating to the other bubble flare? do you mate bubble (male thread) to bubble (female thread) directly? or should I do the setup like I am doing on other end (bubble male to double sided female connector to bubble male)

I can take some pics if anyone wants to see what I am talking about.


original connections-bubble flare was in the Left fitting, ? flare in the right



here are the lines-bubble on left into ? on right




views of two lines-bubble left and ? on right




? flare on Left compared to double inverted flare on right. much steeper angle on inverted flare



way I am joining the new line to old where I had to actually cut line. will use bubble flares on each side.

[jd-autotech]

thats an iso bubble flare u may have to stop at ur local dealer and have them make u up one or alot of part stores have fitting adaptors.

[hammer2]

I stated that the one was a bubble flare (picture 2 , 3 and 4 on left) but picture 2 , 3 and 4 on right certainly looks different than the left? looks closer to double inverted flare that appears in pictures 5 and 6 on right, except the double inverted is steeper. are you saying that BOTH are bubble flares (both left and right in pics 2,3,4?) that is what I suggested when I said that maybe it is bubble that has crushed when it was tightened up against the other bubble. I have a tool to do inverted, double inverted and bubble flares. Already put bubble flares on the other line I replaced.

[jd-autotech]

they are both called bubble flares but the one u need is called an iso bublle flare the is a tool to make them but its exspensive and most dealers have them and will make up a peice for u.

[hammer2]

sorry, but I don't think this is correct. Everything I had read PRIOR to your post suggested that ISO bubble and bubble are in fact the same thing. ISO bubble is more exact name, but it is commonly just called bubble. The tool that I have ($50)is listed as doing ISO bubble flares and single flares and double inverted flares. The bubble flares in makes look like the bubble flares that I bought (shown in photos 2,3,4 on left). The flare that is in question looks nothing like a bubble as shown in photos. Unless of course it gets deformed when tightened?? Here is a link to some info that I looked up after your post:

www.fedhillusa.com/webnuts/common%20flares6.pdf

[richtazz]

the anodized red colored fittings you have in the picture in post 1, are Japanese thread. Your oem lines use a different thread pitch called European, and the replacements with the correct thread pitch will be either anodized blue, or a khaki green in color. If you have the correct thread union, and are just using these as a repair, it's not that big of a deal, but if you're using them to thread into any factory components, you're going to cross-thread/strip the OEM component using the red fittings. Also, you MUST use a proper bubble flare tool to reflare the lines, or they will leak like a seive.

[hammer2]

the red fittings are what came with new tubing. I am not using them, just used for photo. They were actually listed as US thread on the tag. I think it said something like iso metric bubble with US thread. they did not fit. The two ends of factory piece had different sizes on them so I replaced these red with 10mm x 1.0mm(khaki green? seen in photos-picture 1 on left) and 12mm x 1.0mm (blue) fittings from NAPA . I re-flared using bubble flare tool. according to the link I supplied, the red are likely 3/8x24 UNF American thread. It fit into the factory nut but was pretty loose. 3/8" is 9.25mm and 24 thread/inch is close to 1mm pitch (25.4 threads/inch). so 3/8 x 24 would fit loosely and thread into the factory nut. as the link said-hopefully it would strip out when tightening or maybe you wouldn't know and it would simply fail later! I knew it wasn't right as soon as I tested it and went to NAPA and got right part. The guys at Advance gave me the wrong fittings even though I had it in hand when I was there.

so thoughts on what my one flare is? is it simply crushed bubble? That would mean that the union was bubble to bubble? would that be correct? I have heard that they crush and therefore they do have limited number of times that you can reuse them. think I should just put a union there?