1. Welcome to Tundras.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tundra discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other Tundra owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

HOW TO? Rusted/bonded brake line fittings

Discussion in '2.5 Gen Tundras (2014-2021)' started by trd_in_cny, Aug 29, 2022.

  1. Aug 29, 2022 at 9:44 AM
    #1
    trd_in_cny

    trd_in_cny [OP] Code jockey and cloud monkey

    Joined:
    Jun 23, 2022
    Member:
    #79891
    Messages:
    24
    First Name:
    Donny
    Central NY
    Vehicle:
    2015 TRD DC Limited
    Hi, doing a brake overhaul with the PowerStop Z3 line. I wanted to replace the pictured flex hose runs with the PowerStop stainless steel brake hose kit. I'm encountering the typical rusted connections between rigid and soft lines. PB fluid was not successful - I am noticing line twist in the rigid line so I stopped. I've read that MAPP gas works well. Does anyone have suggestions, lessons learned, definitely don't try this, kind of guidance they could offer up? I'm not opposed to replacing that one short one segment of rigid line that goes up above the wheel well - but I know how this can go as you keep working your way up the line trying to break a connection free...

    BFBE809C-4162-4E1D-A43A-4A77E19D6CC1.jpg
     

    Attached Files:

  2. Aug 29, 2022 at 9:50 AM
    #2
    des2mtn

    des2mtn Too full to swallow my pride

    Joined:
    Jul 1, 2020
    Member:
    #48721
    Messages:
    3,896
    SW
    Vehicle:
    2004 Black DC Limited 4x4
    Tonto cover
    Torch will be your friend as you said. Are you using a flare wrench or a regular wrench on the fittings? A flare wrench will be less likely to round out the fittings. Or cut the line and get a six point socket on the stubborn fitting.
     
    FirstGenVol and FrenchToasty like this.
  3. Aug 29, 2022 at 9:59 AM
    #3
    trd_in_cny

    trd_in_cny [OP] Code jockey and cloud monkey

    Joined:
    Jun 23, 2022
    Member:
    #79891
    Messages:
    24
    First Name:
    Donny
    Central NY
    Vehicle:
    2015 TRD DC Limited
    Flare wrench. I've no problem locking into the nut, it just won't break at all. My problem is that each fitting above and below is rusted too. So, I'm concerned that I'll end up snapping shit all the way up to the master cylinder.
     
    des2mtn[QUOTED] likes this.
  4. Aug 29, 2022 at 10:01 AM
    #4
    Northbound Train

    Northbound Train Masshole

    Joined:
    Mar 4, 2019
    Member:
    #27050
    Messages:
    327
    Gender:
    Male
    First Name:
    Glenn
    Western MA
    Vehicle:
    Black 2016 SR5 Double Cab 4x4 5.7
    Everyone has their favorite rust penetrant, I've had the best luck with AeroKroil. Try soaking repeatedly for several days, The top in addition to the threads so it won't twist the line. Use a quality brake line wrench and see if you have any luck. If not, it won't hurt to try some heat. If that doesn't do it, it looks like there is enough slack in the hard line that you could cut it flush with the top of the fitting, slide a new fitting on and reflare the line. Then bend the line down slightly to it reaches. Good luck with it!
    A tip, I've lived in the Northeast my whole life and have encountered this often enough that, not only do I keep the underside of my Tundra sprayed with NH Oil (like Fluid Film) but I smear grease on all the metal brake connections on the underside of the vehicle before they rust. I can clean the grease off of any of them and they will look like new.
     
    trd_in_cny[OP] likes this.
  5. Aug 29, 2022 at 10:01 AM
    #5
    des2mtn

    des2mtn Too full to swallow my pride

    Joined:
    Jul 1, 2020
    Member:
    #48721
    Messages:
    3,896
    SW
    Vehicle:
    2004 Black DC Limited 4x4
    Tonto cover
    Gotcha. Maybe try taking the clip out that holds the rubber hose and put some vice grips on the rubber hose and twist from there?
     
  6. Aug 29, 2022 at 10:10 AM
    #6
    trd_in_cny

    trd_in_cny [OP] Code jockey and cloud monkey

    Joined:
    Jun 23, 2022
    Member:
    #79891
    Messages:
    24
    First Name:
    Donny
    Central NY
    Vehicle:
    2015 TRD DC Limited
    What's ironic (and a real pisser) is that I literally crawl underneath mine in the winter and spray the shit out of it on warmer winter days. In my driveway, so I'm not cleaning it off and then immediately driving on wet salty roads again. It's not until recently that I started scrutinizing the truck for troublesome rust and I felt like I had wasted all that effort every winter. I am doing the woolwax treatment this year.

    I plan to take a similar approach to all my replacement work as you mentioned, with the grease.
     
  7. Aug 29, 2022 at 11:06 AM
    #7
    BlueCrushSC16

    BlueCrushSC16 New Member

    Joined:
    Jan 27, 2021
    Member:
    #58224
    Messages:
    782
    Gender:
    Male
    Charleston, SC
    Vehicle:
    2023 BluePrint 1794 iForceMax Crewcab 4x4
    You'll need repeated PB blaster application, wire brush, and heat to cure your rust woes.
     
    trd_in_cny[OP] likes this.

Products Discussed in

To Top