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Brake bleed process for extended brake lines

Discussion in '3rd Gen. Tacomas (2016-2023)' started by Gutentight, Jan 31, 2021.

  1. Jan 31, 2021 at 8:31 AM
    #1
    Gutentight

    Gutentight [OP] Well-Known Member

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    Looking to figure out if I am missing anything before screwing with the brakes. Plan to swap in rear 2" extended SS brake lines (gather likely not required with 5160 shocks, but not a bad idea either). Seems to be just a minor PIA to swap the actual lines, then main question is about bleeding the air afterward.

    1. Going to assume the air won't get all the way back up to the pump and accumulator... what is the likelihood of needing to use Techstream to bleed the ABS actuator?

    2. Anything special to know about the process for the hydraulic boosted OR and Pro brakes?

    Background info from searching around:
    https://www.tacomaworld.com/threads...ng-for-dummies-me.602575/page-3#post-20277534

    Note about hydraulic boosted OR and Pro models.
    https://www.tacomaworld.com/threads/how-to-bleed-brakes.653754/#post-22767742
     
  2. Feb 1, 2021 at 1:50 PM
    #2
    GHOST SHIP

    GHOST SHIP hates you.

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    Ive done brake line installs on several trucks and I always bleed the brakes manually (truck off) using the standard procedure (furthest to closest). If you’re quick about getting on old lines off and the new ones on then the air intrusion should stay limited to the rear lines. It’s always safe to bleed all 4 but you’ll likely see very little air in the front lines.
     
    Big tall dave, whatstcp and Tacospike like this.
  3. Feb 1, 2021 at 2:10 PM
    #3
    littlefish

    littlefish Buzz, your girlfriend...

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    The one who dies with the most stuff wins.
    I installed extended lines after installing 5160s, just as you.

    No need for Techstream. Make sure you master cylinder is full before you start. Bleeding process like normal. HOWEVER, I have heard that if you allow the MS to get too low, you will get air in the system at the top, then you will need Techstream. So start at the right rear wheel, and get closer to the MS each time. Top off the MS after every wheel.
     
    Gutentight[OP] and eurowner like this.
  4. Feb 1, 2021 at 2:55 PM
    #4
    ShimStack

    ShimStack Well-Known Member

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    Gutentight[OP] likes this.
  5. Feb 1, 2021 at 3:00 PM
    #5
    rnish

    rnish Well-Known Member

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    After I pulled the original brake lines. I put vacuum line caps over the brake line to stop brake fluid from leaking more than necessary.
     
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  6. Feb 4, 2021 at 7:00 AM
    #6
    Gutentight

    Gutentight [OP] Well-Known Member

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    Update - really no issues with it, didn't lose much fluid during the change. Putting the higher end of the line on first probably helped since I didn't really see air coming out when bleeding afterwards. Just those upper metal retainer tabs suck to remove.

    It mentioned it in the tech guide above.. but also when topping off fluid should pump the petal because extra will go into the reservoir, which could push it above max fill ...

    Thanks for the help
     

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