Register now to get rid of these ads!

Correct brake line size?

Discussion in 'The Hokey Ass Message Board' started by tfee, Apr 21, 2008.

  1. tfee
    Joined:
    Oct 10, 2006
    Posts:
    139
    Location:
    Livonia, MI

    tfee Member

    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
  2. 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.
  3. lostn51
    Joined:
    Jan 24, 2008
    Posts:
    1,666
    Location:
    Bikini Bottom

    lostn51 Member

    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.
  4. lostn51
    Joined:
    Jan 24, 2008
    Posts:
    1,666
    Location:
    Bikini Bottom

    lostn51 Member

    see i just learned me something new.........
    Register now to get rid of these ads!

  5. tfee
    Joined:
    Oct 10, 2006
    Posts:
    139
    Location:
    Livonia, MI

    tfee Member

    Thanks, I will run with the 1/4" then
  6. 325w
    Joined:
    Feb 18, 2008
    Posts:
    3,501
    Location:
    texas

    325w
    ALLIANCE MEMBER

    If you run 1/4 don't you have to have an adapter to go into the wheel cly?
  7. Paul2748
    Joined:
    Jan 8, 2003
    Posts:
    1,537
    Location:
    Midland Park, NJ, USA

    Paul2748 Member

    Run 3/16 - don't putz around with different sizes
  8. Rex Schimmer
    Joined:
    Nov 17, 2006
    Posts:
    729
    Location:
    Fulton, CA

    Rex Schimmer Member

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

    Rex
  9. Fogger
    Joined:
    Aug 18, 2007
    Posts:
    1,181
    Location:
    San Fernando, Calif

    Fogger Member

    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
  10. enjenjo
    Joined:
    Mar 2, 2001
    Posts:
    2,284
    Location:
    swanton oh

    enjenjo Member

    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.
  11. HemiRambler
    Joined:
    Aug 26, 2005
    Posts:
    3,970
    Location:
    Cleveland, Ohio

    HemiRambler Member

    ^^^^^^^^^^^^
    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.
  12. 35Chevy.com
    Joined:
    Nov 27, 2007
    Posts:
    542
    Location:
    New Jersey

    35Chevy.com Member

  13. RustyBolts
    Joined:
    Oct 26, 2006
    Posts:
    2,203
    Location:
    East Bay Area, California

    RustyBolts Member

    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.
  14. 36-3window
    Joined:
    Apr 10, 2002
    Posts:
    10,818
    Location:
    in my own little world

    36-3window Member

    we are seriously getting close to over thinking this

    run 3/16 or 1/4...whichever works out best for you
  15. enjenjo
    Joined:
    Mar 2, 2001
    Posts:
    2,284
    Location:
    swanton oh

    enjenjo Member


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

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2013 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.