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"Hard shift" whiling pressing in brakes

Discussion in '2nd Gen. Tacomas (2005-2015)' started by 2010TacomaTRD1989, Dec 27, 2018.

  1. Dec 27, 2018 at 5:04 AM
    #1
    2010TacomaTRD1989

    2010TacomaTRD1989 [OP] New Member

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    Hello. I am a new owner of a 2010 4 door Tacoma TRD. The truck has 124622 miles and came with a 3 and 3.5 inch lift, rear view camera, some cool tires and rims and a nice audio system when I bought it, blah blah blah, it's a cool truck. I have had no issues except for 2.
    My first issue was the exhaust brackets rusting through and falling off. I've fixed easy enough.

    ****Now for the meat of the post and the 2nd and newest issue: over the past month or two I have taken my Tacoma to the dealership for a recall due a faulty leaf spring that could cause the chassis to collapse on the fuel tank. That's been fixed. Noted on my report paper was a note that said my brakes felt "spongey"
    Over the last few weeks, occasionally when I am holding the brakes at a red light or stop sign my truck feels like it is violently shifting, it feels like it lurches forward. It feels just like a manual transmission shifting gears (mine is an automatic). Please note, it does this around 10-15 seconds after having fully braked to a complete stop.
    I am currently in my truck running and in park and it has not done it. I only get this violent feeling shift while holding the brakes after driving for a bit. Is this possibly a brake related issue?****
    Thank you in advance
     
    Last edited: Dec 27, 2018
  2. Dec 27, 2018 at 5:19 AM
    #2
    TacomaMike37

    TacomaMike37 Well-Known Member

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    Samething happens to my truck on occassion. I wouldnt call it violent.

    Are you sure its violent or are you embellishing?
     
  3. Dec 27, 2018 at 5:25 AM
    #3
    2010TacomaTRD1989

    2010TacomaTRD1989 [OP] New Member

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    I call it violent because a vehicle shouldn't be doing that with the brakes pressed.
    To the honest,the intensity varies. Sometimes it's barely noticeable, other times I would call it violent because it feels like the brakes release and the truck wants to move on it's own. And that's not ok
     
  4. Dec 27, 2018 at 5:35 AM
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    Plain Jane Taco

    Plain Jane Taco I have become comfortably numb

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    Compressor surge. It can feel strong if your foot is not firmly on the brakes. Maybe your suspension and wheel/tire setup is exaggerating the issue. I don't know.

    Bottom line...it happens when your A/C and/or either defrost mode is selected
     
    Last edited: Dec 27, 2018
    SR-71A and TacomaMike37 like this.
  5. Dec 27, 2018 at 5:37 AM
    #5
    TacomaMike37

    TacomaMike37 Well-Known Member

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    Yup. Thats what I believe it is as well.
     
  6. Dec 27, 2018 at 5:37 AM
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    TacomaMike37

    TacomaMike37 Well-Known Member

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    Just gotta get used to it unfortunately. It threw me for a loop the first few times it happened to me!
     
  7. Dec 27, 2018 at 5:44 AM
    #7
    SR-71A

    SR-71A Define "Well-Known Member"

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    Mobtown sliders, ARB bar, Icon RXT leafs, extended & adjustable Kings, JBA UCAs, Tepui Ayer 2, dual batteries, Gen2 xrc9.5 winch, CB, GMRS, S1 ditch lights...
    Mine does that as well. Whenever the A/C compressor cycles on (A/C or defrost) at a stop but in Drive you can feel it. Its weird. Never had another vehicle that did that..

    If the techs noted your brake are spongy, its worth looking into that yourself. With 125k miles it you could very well need new brakes. Which could lead to your feeling the surge more
     
    Last edited: Dec 27, 2018
  8. Dec 27, 2018 at 5:57 AM
    #8
    2010TacomaTRD1989

    2010TacomaTRD1989 [OP] New Member

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    Thank you guys for the feedback. I am going to get the brakes checked soon but I wanted to see how severe the issue could have been potentially.
     
    Plain Jane Taco likes this.
  9. Dec 27, 2018 at 5:57 AM
    #9
    Plain Jane Taco

    Plain Jane Taco I have become comfortably numb

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    The A/C compressor puts a decent load on the engine when it engages. Not something you notice much when the engine's rpm is up during driving. But at idle, where the engine is not developing much power, it would pull the idle way down. So just as the compressor engages, the ECU bumps the idle a bit to compensate for the drag. The 1GR has some moderate torque off idle. So that can sometimes add to the intensity. Having your foot lightly on the brake can make it seem worse too.

    I suppose how that feels is subjective though. I certainly wouldn't describe it as violent. Again...perhaps your suspension and wheel/tire setup is adding to the sensation
     

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