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Brake line fitting sizes are killing me...

Old 02-17-2019, 08:49 AM
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Default Brake line fitting sizes are killing me...

'96 ZJ w/ rear disc brakes- Here's my best guesses:

Master Cylinder to Combination Valve - DIN/ISO Bubble Flare - one M10 x 1 fitting, one M12 x 1 fitting
Combination Valve From MC - SAE/Double Inverted Flare - one 7/16-24 fitting, one 1/2-20 fitting
Combination Vale to HCU - SAE/Double Inverted Flare - one 3/8-24 fitting, one 1/2-20 fitting
HCU from Combination Valve - DIN/ISO Bubble Flare - one M10x1 fitting, one M12x1 fitting
HCU to Brake Lines - DIN/ISO Bubble Flare - Right M11 x 1.5, Left M12 x 1, Rear M10 x 1
Front Lines to Hoses - SAE/Double Inverted Flare - 3/8-24
Rear Line to Rear Hose - SAE/Double Inverted Flare - 3/8-24 fitting
Rear Lateral Lines - SAE/Double Inverted Flare - 3/8-24 on both ends

Total:
3x M10x1
1x M11 x 1.5
3x M12x1
1x 7/16-24
2x 1/2-20
8x 3/8-24

Hopefully this will be helpful to someone else. Also, let me know if anything seems wrong!

Last edited by Hatsuwr; 02-17-2019 at 11:17 AM.
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Old 02-17-2019, 04:14 PM
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This all came about because I broke a hard line or three while trying to get the hoses off. Just going to redo all the lines now. After a big internal debate between stainless and copper-nickel tubing, I decided on the
latter latter
.

Got
these these
fittings for inside the engine bay. Think they're brass or steel. Doesn't matter much, since I got
these these
stainless steel ones for all the fittings outside the engine bay.

The only real downside to the copper-nickel is decreased erosion/impact resistance. Chances are though, that anything that takes out these lines would have taken out stainless as well. Still, I got
this this
stainless line protector. I was a bit worried about galvanic corrosion of the lines caused by the protector, but they should only be about 1.5V difference max, so it *should* be fine. I hope.

I also spent way too much money on
this this
flaring tool. I figure I'll be using it several times in the future though, and if I'm flaring tubing, it's almost definitely something where I'm willing to pay a little more for quality.

I plan on straightening the tubing with just a long hole drilled through a length of 2x4. Not perfect, but I don't see anything significant to be gained from a real straightener. Similarly, I'll probably just use a large socket for bending. I'm on the fence about buying a bending tool, but I just don't think I'll get better results by using it in this case.
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Old 02-19-2019, 07:03 AM
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I hear you. I just re used all of the fittings when I replaced my brake lines.
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Old 02-19-2019, 11:14 AM
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A few of mine required... convincing to remove.
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Old 02-19-2019, 03:15 PM
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I have the same flaring tool and it's worth it's price. I also have the Eastwood tool https://www.eastwood.com/professiona...ring-tool.html which works great as well but needs a vice.

Last edited by Reekor; 02-19-2019 at 03:20 PM.
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Old 02-19-2019, 03:20 PM
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Originally Posted by Hatsuwr View Post
A few of mine required... convincing to remove.
I know what you mean but I just convince them back on again lol
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Old 02-26-2019, 07:58 AM
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I just take the old one in and match it up.
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Old 02-27-2019, 06:43 PM
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autozone rents for free the bender and flaring tool BTW.
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