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All you brake afficionados...

Discussion in '2.5 Gen Tundras (2014-2021)' started by TundraTss, Jun 17, 2020.

  1. Jun 17, 2020 at 4:17 PM
    #1
    TundraTss

    #1
    TundraTss [OP] The Mistress

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    Man, it has been a LONG tike since I posted in here.. glad y'all survived the Rona.

    So 2014 Tundra. New pads, calipers, rotors x4 about a month ago. No issues. Over the past few days I've been losing pressure when I'm stopped at red lights etc. Have to pump the pedal or just put in P because it'll eventually start rolling forward. Don't see any leaks anywhere, not sure of it's the master?? Don't think it's the booster because it depresses, so....

    Questions comments concerns?
    Thanks, guys. Appreciate you
     
    TundraTss, Jun 17, 2020
    #1
  2. Jun 17, 2020 at 4:23 PM
    #2
    johnnyskullface

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    johnnyskullface New Member

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    Sounds like a leak in the master cylinder. Sometimes they can show signs of a leak on the inside of the cab where the stop light switch is.
     
    johnnyskullface, Jun 17, 2020
    #2
  3. Jun 17, 2020 at 4:35 PM
    #3
    TundraTss

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    TundraTss [OP] The Mistress

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    Roger, I'll check it out.
    Thanks man...
     
    TundraTss, Jun 17, 2020
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  4. Jun 17, 2020 at 6:18 PM
    #4
    chugs

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    chugs New Member

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    upload_2020-6-18_4-19-7.jpg
     
    chugs, Jun 17, 2020
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    Black Wolf likes this.
  5. Jun 17, 2020 at 7:07 PM
    #5
    WhitmanTundra

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    WhitmanTundra New Member

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    I concur with Johnnyskullface. That seems to be a likely solution. If there are for sure no leaks, and you aren't losing brake fluid, could be that your master cylinder seal is maybe faulty?
     
    WhitmanTundra, Jun 17, 2020
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  6. Jun 17, 2020 at 7:28 PM
    #6
    TundraTss

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    TundraTss [OP] The Mistress

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    yyyeah that's what I'm assuming. I pulled as much into the system from the reservoir as possible and it's still sinking at red lights so I'm gonna have to get underneath it and take a look.

    ...and then just go ahead and get that Wilwood setup. Because upgrade.
     
    TundraTss, Jun 17, 2020
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  7. Jun 18, 2020 at 11:35 AM
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    cooper4x4

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    cooper4x4 New Member

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    There's a TechStream process to bleed the ABS system if you think you got air that far up. Did the Master Cylinder lose all fluid?

    I'd double-check that you don't have air in the system.
     
    cooper4x4, Jun 18, 2020
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  8. Jun 18, 2020 at 12:42 PM
    #8
    TundraTss

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    TundraTss [OP] The Mistress

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    The reservoir was a little low but I can't remember the last time I filled it and I just had my brakes done so I'm thinking/hoping that there was just air in the line. It seems like it's getting better but I've only driven a little since yesterday..
    We shall see......
     
    TundraTss, Jun 18, 2020
    #8
  9. Jun 18, 2020 at 1:18 PM
    #9
    ezdog

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    ezdog New Member

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    Brakes are one of those systems that I like to think we all appreciate working properly?
     
    ezdog, Jun 18, 2020
    #9
    chugs likes this.
  10. Jun 18, 2020 at 2:08 PM
    #10
    cooper4x4

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    cooper4x4 New Member

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    Won't get better on it's own if there is air in the system. Consider purchasing a power bleeder such as the Motive with one of these
    $74 Power Probe BA10 Small Adapter for Toyota
    https://smile.amazon.com/gp/product/B004IQ96RK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
     
    cooper4x4, Jun 18, 2020
    #10
    TundraTss[QUOTED][OP] and Black Wolf like this.
  11. Jun 18, 2020 at 3:51 PM
    #11
    johnnyskullface

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    johnnyskullface New Member

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    Normally when brakes are done there is no need to crack any lines that would allow air in the system. Also, if you can pump it up and it gets firm and then over time keeps sinking its not likely air in the system. Air in the system will be spongy all the time due to the air being able to compress more than the fluid. It would be an easy thing to double check for air in the system, but don't bank on that being the issue.
     
    johnnyskullface, Jun 18, 2020
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    TundraTss[OP] likes this.
  12. Jun 18, 2020 at 3:55 PM
    #12
    cooper4x4

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    cooper4x4 New Member

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    He replaced calipers.
     
    cooper4x4, Jun 18, 2020
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  13. Jun 18, 2020 at 7:59 PM
    #13
    SuperWhite20

    #13
    SuperWhite20 New Member

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    Bleed them. Right rear, left rear, right front, left front. Then the master cylinder lines.
     
    Last edited: Jun 27, 2020
    SuperWhite20, Jun 18, 2020
    #13
  14. Jun 19, 2020 at 4:32 AM
    #14
    T-Guy69

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    T-Guy69 New Member

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    This! Bleed the system. Tap the calipers with a rubber hammer. Air bubbles get trapped. By driving, you may have knocked some loose.
     
    T-Guy69, Jun 19, 2020
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