I'm looking to reflare my front right brake line (the hard one coming from ABS pump) since the flare nut on there is completely rounded off. Can this tool from HF work to create the correct bubble flare I need?

Item #5969: https://www.harborfreight.com/7-piece-tube-flaring-kit-5969.html

Also, what is the correct flare nut to replace on the lines? Is it 3/16 M10x1.0 bubble flare? Would something like this be correct to replace with?

https://www.amazon.com/Brake-Metric-Thread-Bubble-Flare/dp/B076CX7YMP/ref=sr_1_6

you can rent a double flaring tool from autozone and it will make a regular double flare, you can then buy an adapter for abt 5 bucks from autozone that takes in a double flare and becomes a bubble flare.

you can even just buy a euro/later GM/metric line section with nut installed from autozone (about 5 or 6 dollars for a 5 ft) and cut the line then join them with a proper brake line union fitting - all sold at autozone too.

the double union and new metric/euro/later GM line will be easiest as you get a bubble flare perfectly formed with preinstalled nut for you, and you can rent the tool to make the double flares for the union you are going to use.

lowest cost solution and no playing dodgeball with a half double to act as a DIN bubble, the base angle is incorrect for a DIN bubble flare that way and you will run a risk of blowout when you ram the brakes.

p.s. the brake line nuts are sold at parts shops too - all sorts and sizes - you need the one you see on amazon - I paid about 5 bucks for a blister pack of 4.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

My first step would be to use small vise grips to remove the nut then reinstall unless I was selling or working on someones car.


I've flipped the holding bar over to make the back angle flat and used the Double flare insert. The key is to not fully form the Double flare so it forms in place during install.

With Bubble flare more common, using the proper tool isn't expensive.

I have a few different varities of bubble flaring tools, but using the back of the bar with a double flare die doesn't guarantee a flare, the bubble flare tools have a die that threads into the tool and prevents rocking as its cinched down.


The double flare die sits free and rocks too easy and eventually makes a bad flare.


The short sections being sold at parts stores make repairs very easy for a diy person.

Your recommendation of not fully forming the bubble on the tool is top notch, the actual flare mating face will be done when its screwed into the female fitting.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)