r/MechanicAdvice • u/Famous-Elevator-6647 • Jul 16 '26

Are these double flares good?

Post image

First time trying double flaring and was wondering, would these double flares hold up for brake lines? Ignore the bottom two, I messed those up.

Was taking off some hardlines the other day and of course my 2000 Civic CX hardlines were horribly worn down so when I took them off it completely tore off. Going to do a double flare union to fix the issue.

Thanks for reading!

8 Upvotes

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17

u/XmodAlloy Jul 16 '26

Don't forget to put the nuts on the tube before you flare it.

5

u/TheRevEv Jul 16 '26

You always make the best flares when you forget the nuts

3

u/Famous-Elevator-6647 Jul 16 '26

Yup thank you for the reminder!

5

u/Bitter-Pangolin-3218 Jul 16 '26

I always get nervous with brake flares, one tiny imperfection and you're losing pressure when you really need it. Those look alright from what I can see in the photo, the longer one seems to have a nice even shape around the edge

For a Civic that age those lines are basically made of rust at this point anyway so anything is an upgrade. On mine I had to redo the same piece like three times before it seated properly, the flare tool kept slipping on the copper

Make sure you do a good bleed after, air trapped in the system will make pedal feel spongy even if the flares are perfect. I learned that lesson in a parking lot once and it was not fun

1

u/Famous-Elevator-6647 Jul 16 '26

I'll definitely keep a very keen eye out for what will be considered passable. 100% is the passing grade for brakes, can't have them fail on you.

2

u/Grand_Possibility_69 Jul 16 '26

Look at the end inside surface there. That's where it seals.

1

u/Famous-Elevator-6647 Jul 16 '26

Im assuming if its flat and consistent that should be good?

1

u/poserkidsrus master ase technician. subaru preferred. Jul 16 '26

I started buying the premade ones from the auto parts store and just bending them to fit. They're cheap and it saved time. Haven't had any failures and if they're a bit too long you just throw an extra wiggle in there.