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Old 04-21-2008, 09:12 PM   #1
tfee
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Default Correct brake line size?

I will be doing the brakes on my highly modified model t soon and I don't know what brake line size to use. I have 12" drums on all 4 corners and a 1" bore master cylinder from an old econoline van. Should I run 1/4" line to the t's and 3/16" from there or will 3/16" suffice all around?
Thanks in advance
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Old 04-21-2008, 09:20 PM   #2
Eyeball
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Default Re: Correct brake line size?

I run 1/4". It was what was on the early Fords and I seem to have better luck doing the double inverted flares on the larger size for some reason.
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Old 04-21-2008, 09:20 PM   #3
lostn51
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Default Re: Correct brake line size?

Id run 3/16" all the way around but thats just me. i cant recall ever seeing any 1/4" in brake lines but then again i have not seen everything thats out there either.
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Old 04-21-2008, 09:22 PM   #4
lostn51
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Default Re: Correct brake line size?

Quote:
Originally Posted by Eyeball View Post
I run 1/4". It was what was on the early Fords and I seem to have better luck doing the double inverted flares on the larger size for some reason.
see i just learned me something new.........
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Old 04-21-2008, 09:37 PM   #5
tfee
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Default Re: Correct brake line size?

Thanks, I will run with the 1/4" then
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Old 04-21-2008, 09:41 PM   #6
325w
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Default Re: Correct brake line size?

If you run 1/4 don't you have to have an adapter to go into the wheel cly?
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Old 04-21-2008, 09:46 PM   #7
Paul2748
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Default Re: Correct brake line size?

Run 3/16 - don't putz around with different sizes
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Old 04-21-2008, 10:06 PM   #8
Rex Schimmer
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Default Re: Correct brake line size?

Use the 3/16 size it will give you a firmer pedal.

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Old 04-21-2008, 10:23 PM   #9
Fogger
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Default Re: Correct brake line size?

Good advice is to run the same size as master and wheel cylinders. Early Ford was 1/4" all arround. But new system wheel cylinders and master are generally 3/16". I've been using 3/16" on all the cars I've build that way I don't need adapters. The FOGGER
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Old 04-21-2008, 10:26 PM   #10
enjenjo
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Default Re: Correct brake line size?

As far as brake line size, the brakes don't care what size they are. Old Fords, pre 48 used 1/4" lines. 49 and up Fords used 3/16". GM until recently used 1/4" in the rear, and 3/16" in the front. Line size does not change the pressure on the wheel cylinders.
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Old 04-22-2008, 10:53 AM   #11
HemiRambler
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Default Re: Correct brake line size?

^^^^^^^^^^^^
What Enjenjo said

EDIT:

Technically speaking the smaller line will carry more pressure - which might explain why Detroit went to 3/16" - the advent of disc brakes doubled line pressure.
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Last edited by HemiRambler; 04-22-2008 at 11:04 AM.
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Old 04-22-2008, 06:18 PM   #12
35Chevy.com
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Default Re: Correct brake line size?

Bernoulli's Principle states that as the speed of a moving fluid increases, the pressure within the fluid decreases.

Want to know more check this out, Its kewl

http://home.earthlink.net/~mmc1919/venturi.html

Gary
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Old 04-22-2008, 06:44 PM   #13
RustyBolts
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Default Re: Correct brake line size?

I always do 3/16" all around. A few things good about the 3/16" is that you can make bends with a tighter radius using a tubing bender, and you can make gentle bends or adjustments easily with your bare hands.

Get a good tubing flaring tool. It sucks trying to make the flares with a piece of crap tool. When you get a line all bent and cut perfectly, the last thing you want is to have the flare get ruined by trying to use a junky flaring tool. I bought a used old Blue-Point flaring kit, and it's never let me down.
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Old 04-22-2008, 07:22 PM   #14
36-3window
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Default Re: Correct brake line size?

we are seriously getting close to over thinking this

run 3/16 or 1/4...whichever works out best for you
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Old 04-22-2008, 10:23 PM   #15
enjenjo
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Default Re: Correct brake line size?

Quote:
Originally Posted by 35Chevy.com View Post
Bernoulli's Principle states that as the speed of a moving fluid increases, the pressure within the fluid decreases.

Want to know more check this out, Its kewl

http://home.earthlink.net/~mmc1919/venturi.html

Gary

In technical terms, there is no "flow" in a brake system. The fluid moves so little that the Bernoulli principle does not really apply.
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