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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » New Brake Line Pressure Test

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    12/13/2013 1:44 PM  #1

    Chelby-Ann
    FYI Addict

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    From: Mocksville, North Carolina
    Registered: 4/07/2013
    Posts: 156

    New Brake Line Pressure Test

    Does anyone know how to bench test new brake lines for leakage to ensure that the double flares are being done right?
    I would hate to make all my brake lines and come to find out that I made bad flares.

    Thanks

     

    12/13/2013 6:23 PM  #2

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 11,744

    Re: New Brake Line Pressure Test

    If the flares look concentric with the tubing and you did not overtighten the second step of the process, they will be fine.  Otherwise, hook them up to a master cylinder, bleed the line and cap the far end.  Pump the mc and see what happens.  A waste of time and brake fluid, IMHO.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    12/14/2013 10:00 AM  #3

    DC
    Senior 24-7 FYI Addict

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    From: Marshall, MI
    Registered: 4/01/2013
    Posts: 1,235

    Re: New Brake Line Pressure Test

    Since I use the MS method and do not over flair the double flair and let the actual torquing of the tuboe onto the actual fitting in place do the final setting of the flair so it mates perfectly with the fitting is to be used on, I never have a leak. I do make sure the flair is even (I understand this word) when I take it off of the flair tool. If any part of the flair is uneven or off set, I do it over. As with most things, preparation is everything. The cut must be square and properly deburred. A little attention to detail and it is easy. The hardest part should be remembering to put the proper flair nut/fitting on in the correct direction!

     

    12/14/2013 3:51 PM  #4

    Alan
    I FYI 24-7

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    From: Axtell KS
    Registered: 4/03/2013
    Posts: 484

    Re: New Brake Line Pressure Test

    I did have a leak on one of my front lines after I had put it in. I was able to cut it off an flare it on the car. Just unbolted the holder and pulled it away from the car enough to work on.
     

    67 Coupe, 5.0 EEC IV Fuel injected. T5, 3:70 rear
     

    12/14/2013 8:31 PM  #5

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 11,744

    Re: New Brake Line Pressure Test

    I used a sharp 3/16" drill bit to deburr the tubing ID.  Then make sure the end cut is square.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    12/14/2013 10:28 PM  #6

    Bullet Bob
    Senior 24-7 FYI Addict

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    From: Montrose, Colorado
    Registered: 4/01/2013
    Posts: 4,786

    Re: New Brake Line Pressure Test

    MustangSteve wrote:

    I used a sharp 3/16" drill bit to deburr the tubing ID.  Then make sure the end cut is square.

    And...don't forget to use a little air pressure to blow the chips out of the line.

    BB

    "you get what you pay for, good work isn't cheap, and there are NO free lunches...PERIOD!"
     

    12/14/2013 10:32 PM  #7

    ponch0v
    FYI Addict

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    From: Coeur d'Alene, ID
    Registered: 4/01/2013
    Posts: 140

    Re: New Brake Line Pressure Test

    ditto!

    square cut, deburr, concentric flair

    and...DO NOT over tighten when you are rolling over the flair. Let torquing the fitting set the flair on assembly.

     

    12/15/2013 11:22 AM  #8

    Chelby-Ann
    FYI Addict

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    From: Mocksville, North Carolina
    Registered: 4/07/2013
    Posts: 156

    Re: New Brake Line Pressure Test

    Thanks everyone.
    Dont overtighten the last flair, deburr real good, end cut is square and patience.

       •Thread Starter
     

     

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