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  1. #1

    Default What size brake front-to-rear-brake line?

    I have a rusted out front-to-rear brake line on my 2000 1500 4x4. The line is so rusted and swollen, I can't really tell what size I'm dealing with. Does 1/4" sound right? I know this is a long shot, but does anyone have a length measurement for that line?

  2. #2
    Caddiac's Avatar
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    You might want to use They can use your vin # to price you the correct line. There may be some information as to the line size in the part description.
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  3. #3


    I don't think I ever got a response from GMPartsdirect.

    I wonder if anyone has any idea what size nut this line uses, particularly where the line connects to the ABS modulator valve.


    Since the line from the modulator valve to the rear uses the far right port on the top row, I had no clearance for a line wrench or a crows foot wrench. I had to cut the line and use a 9/16 socket to remove the flare nut. The nut size (confirmed with a caliper) is 1/2-20. The brake line measures 1/4" coming out of the ABS modulator valve.
    Last edited by NorthJersey; 10-28-2011 at 12:00 PM.

  4. #4


    It is 1/4 line...these trucks are notorious for lines rotting out especially by the l/f wheel

  5. #5


    Quote Originally Posted by 99monguse View Post
    It is 1/4 line...these trucks are notorious for lines rotting out especially by the l/f wheel
    Yeah, I just popped a line near the driver's side wheel.

  6. #6


    Quote Originally Posted by NorthJersey View Post
    Yeah, I just popped a line near the driver's side wheel.
    Fortunately, this one is easily accessible. The port on the abs module that corresponds to the line coming from the rear of the master cylinder(closest to the driver) is on the bottom left. Once again, the nuts are 1/2-20 (9/16 line wrench). I just buy the preflared PVF coated sections and put an adapter at each end. You'll need two 7/16-24 to 1/2-20 adapters (Poly Armour part no. PAA-S420), two 7/16-24 unions (part no. BLU-4B), and one 60" piece of 1/4" brake line (PAX-460) for the lines running from the master cylinder.

  7. #7


    Hi Guys-

    I don't post much but returned to research brake lines.

    I own a 99 Suburban (OBS), brake line burst this morning while towing...not good. It is the one running along DS frame rail to the back.

    Is there a way to buy the parts without using adapters or unions?
    In a perfect world I would like to have it appear not fixed.

    I may do some of the other lines too.


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