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Sound from Applying Brake Pedal (Vacuum leak?)

Discussion in '2nd Gen. Tacomas (2005-2015)' started by AsmCoder8088, May 27, 2012.

  1. May 27, 2012 at 1:09 PM
    #1
    AsmCoder8088

    AsmCoder8088 [OP] New Member

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    Hello all,

    I've got a 2011 Tacoma that I'm pretty happy about. It rides great and hasn't really given me any problems.

    That said, from day one it has always made this strange sound when I apply the brake pedal. When I test drove it, at the time I thought it was just a temporary thing and that it would get "broken in" so to speak and go away on its own... Either that, or I would get used to it.

    Suffice it say, about six months later neither of those outcomes occurred and I'm still stuck with a weird noise from the brake pedal. It is easily heard by both me and other passengers in the vehicle during normal driving.

    So, thinking it may be air in the lines a friend and I bled the brakes at the master cylinder. No luck. So I took it to the dealership where I bought it and they said it was normal and consequently they won't do anything about it.

    Since I'm running out of options I'd like to ask fellow Tacoma drivers if they think the sound is normal.

    I have uploaded a short video clip here:

    http://www.youtube.com/watch?v=gXF0sK-5GoA

    The video was recorded while the engine was operating and in Drive.

    Any feedback would be great! Thanks.
     
  2. May 27, 2012 at 5:09 PM
    #2
    Gincoma

    Gincoma Special Edition Member

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    RIPieces 2005 Tacoma, adios 2011 :'(
    Factory Monster Truck Package with reverse gear.
    both my tacomas have done this (05-11)and do this....its normal
    BTW Welcome to TW :)
     
  3. May 27, 2012 at 5:16 PM
    #3
    Toyota Tech31

    Toyota Tech31 Sometimes when I close my eyes, I can't see.

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    Now adays with toyotas electronics, if there were in fact a vaccum leak from the booster, it would likely set a check engine light, P0171 & P0174, (If i remember right off the top of my head). I had a newer Camry not long ago with this exact problem, other techs had looked and couldnt find the problem, when i looked into the data list with engine running you could see the short fuel trim adjusting greatly (much higher than normal) when brakes were applied.
     
  4. May 27, 2012 at 6:28 PM
    #4
    KenLyns

    KenLyns Lord of War

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    X2. When I complained about the sound, the dealer brought out another Taco from stock. It had the same sound and equally poor pedal feel. So far all hard stops have been accomplished well, on both dry and wet pavement. Keep in mind there a great deal of electronic intervention between the brake pedal and the wheel (ABS, brake assist, EBD...); it's almost like brake-by-wire.
     
  5. May 28, 2012 at 6:54 AM
    #5
    obscurotron

    obscurotron Well-Known Member

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    Look in your engine compartment - do you even have a vacuum booster? Some 2nd Generation Tacomas have vacuum-assist brakes and some have hydraulic-assist brakes (if you have a big brake fluid reservoir, you have hydraulic-assist, if it's small like on the 1st gen trucks, you'll have a vacuum booster.)

    I have a '12 DCSB and it makes the same noise with the hydraulic-assist brakes. Other '12's that I drove made the same noise.
     
  6. May 28, 2012 at 12:03 PM
    #6
    AsmCoder8088

    AsmCoder8088 [OP] New Member

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    thanks for the responses. I suppose it is a normal sound after all.

    obscurotron, I took a photo of the brake fluid reservoir. Is it the large type that you mention? See below:

    [​IMG]
     
  7. May 28, 2012 at 12:46 PM
    #7
    Toyota Tech31

    Toyota Tech31 Sometimes when I close my eyes, I can't see.

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    That is in fact the Hydro Boost system.
     
  8. May 28, 2012 at 5:58 PM
    #8
    1GR

    1GR Toyota Dealer Technician

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    I have had this complaint many times. Every time, it's been the Hydro Boost system. The sound is 100% normal.
     
  9. May 28, 2012 at 6:17 PM
    #9
    ClemsonMGM

    ClemsonMGM Even Firemen Need Heroes...

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    Lift. Tires. Weathertechs. Tint. Stuff like that
    my '11 has done this from day one...
     
  10. May 28, 2012 at 6:20 PM
    #10
    Rich91710

    Rich91710 Well-Known Member

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    Interesting!

    I always liked the idea of Hydroboost, had it on my Duramax, but it was the source of a couple of recalls for leaking hoses.
    The GM Hydroboost is driven by the power steering pump.
     
  11. May 29, 2012 at 8:03 AM
    #11
    Mts49

    Mts49 Well-Known Member

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    Ditto. My '12 has done this since day one.
     
  12. May 29, 2012 at 8:06 AM
    #12
    GP3

    GP3 Well-Known Member

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    Models with hydraulic booster:

    Some 2005-2008 Off Road models.

    All 2009+ Off Road models.
     
  13. May 29, 2012 at 12:28 PM
    #13
    mcdowell

    mcdowell My name is Mudd

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    Wifes Camery did the same thing. Booster was bad. Rare but can happen.
     
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