I am going to replace my rear brake pipes of 2004 D2 td5. Having done lots of internet search, some uses SAE flare tool and other DIN one. It seems to me that SAE one produces double flare and DIN one bubble flare. But a seller told me their SAE tool can produce bubble flare too, it has different form. Anyway, If I understand correctly, flare type depends on brake pipe hoses including jump flexi hoses. I looked at my new BRITS part brake hoses, it looks funnel shaped, does it mean I need DIN bubble tool https://www.ebay.co.uk/itm/282619615626?? Does D2 use DIN bubble flare only. In case I need a connector, do I have to use DIN female union to mate with two DIN M10 male unions?
Also:
A flare pipe union seals by pushing two metal pipes together. The ends of the pipes are angled so that there is a male and a female end; the male end pressing against the female end creates the seal.
Double inverted flare on the left, bubble flare on the right:
In a typical brake line application, the hard line end of the union is the female end - the brake pipe itself is expanded around the center. The hard line also has the nut that applies force necessary to seal the junction. The soft line end is the male end.
Here is another schematic of the metric/SAE double inverted and DIN/ISO bubble flares with photos of the female ends as found on automotive brake hard lines:
PopPops
Well-Known Member
I’ve just done mine. I removed a pipe first to check the flare, which is a DIN type. I used a tool very similar to the one you list. It made flares identical to the ones on the original pipe.
I also used copper/nickel pipe.
Good luck, routing the pipe across the rear to do the O/S rear takes a bit of patience and swearing!
