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Double Flare Or Single Flare In Brake Lines

Discussion in 'Early CJ-5 and CJ-6 Tech' started by Brislin06, Nov 6, 2018.

  1. Nov 6, 2018
    Brislin06

    Brislin06 New Member

    Pennsylvania
    Joined:
    Oct 23, 2017
    Messages:
    23
    I’m starting to re do some of the brake lines and replace the master cylinder on my 69 cj5. My question is would you Guys suggest a single flare or double flare on the brake lines.I know in years past I have single flared many brake lines with no problem. Also should I make a few “coils” in the lines between the master cylinder and the distribution block?
     
  2. Nov 6, 2018
    73 cj5

    73 cj5 Destroyer of Jeeps Sponsor

    Clinton, Mississippi
    Joined:
    Jan 10, 2014
    Messages:
    908
    Double
     
    scoutpilot likes this.
  3. Nov 6, 2018
    TIm E

    TIm E Sponsor Sponsor

    NW Arkansas
    Joined:
    Mar 2, 2017
    Messages:
    395
    The coils are to allow movement and flex between a body/firewall mounted MC and frame mounted brake lines. A 69 should have a frame mounted MC (if original), this makes the coils unnecessary as it is all mounted to the frame.
     
  4. Nov 6, 2018
    PeteL

    PeteL Member Sponsor

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    5,834
    Yes, but false logic.
    The single-flare guys who did have a problem aren't here to tell us about it.

    Double flaring is not that hard. With a very basic hand tool I can do a double flare in four minutes.
     
    Twin2 likes this.
  5. Nov 6, 2018
    Rich M.

    Rich M. Shoe pusher

    Maryland
    Joined:
    Mar 23, 2008
    Messages:
    392
    Double flare. Blow some coin and get a quality flare tool.
     
    Twin2 and FinoCJ like this.
  6. Nov 7, 2018
    Brislin06

    Brislin06 New Member

    Pennsylvania
    Joined:
    Oct 23, 2017
    Messages:
    23
    Thanks for the advice guys!Double flare it is I bought one today
     
    Posimoto likes this.
  7. Nov 15, 2018 at 9:43 PM
    Vanguard

    Vanguard Tracer Bullet PI Staff Member Sponsor

    Brighton, MI USA
    Joined:
    Aug 30, 2006
    Messages:
    1,428
    Double flare. Cupronickel line.
     
  8. Nov 16, 2018 at 2:02 AM
    nickmil

    nickmil In mothballs. Sponsor

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    11,368
    Preparation of the line is key. Bad prep=bad flare.
     
    scoutpilot likes this.
  9. Nov 16, 2018 at 8:13 AM
    PeteL

    PeteL Member Sponsor

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    5,834
    Yes. Especially chamfering both ID and OD.
     

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