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Inconsistent Braking (Slowing to a stop)

Discussion in '5th Gen 4Runners (2010+)' started by liftbikerun, May 28, 2017.

  1. May 28, 2017 at 10:37 AM
    #1
    liftbikerun

    liftbikerun [OP] New Member

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    Hello all - I have a new 2017 SR5, love LOVE the thing. But there are a couple little things that I want to ensure are either normal, or need to be looked at.

    Braking is one of the more inconsistent things I've experienced. I've owned a lot of cars, recently purchased new was a 2012 FJ Cruiser, new 2015 Corolla, new 2016 Tacoma TRD Sport 6spd, Nissan 370z, and then 20+ other cars over the last couple decades. I've owned all different types of vehicles, SUVs, sports cars, motorcycles, etc.

    This is the first vehicle I've had to feather the brakes to get a smooth stop in.

    Let me explain. As I begin to come to a light, I apply brake, as I get closer to say 10mph, I have to start lifting off the brake, otherwise the 4Runner dives considerably, as if more brake is being applied, but over hundreds of stops, this isn't the case.

    So as I stop, I have to lift off the brake farther and farther to keep the truck from stopping abruptly. It's as if as the truck slows and requires less brake to stop, the pressure builds more drastically increasing the braking force which due to the lack of momentum, then causes an abrupt stop.

    I've gotten used to it, but it's annoying for sure. I've never had a vehicle do this in all my years, I don't know if it's a characteristic of the hydraulic system on these things or what.

    Feedback welcome!

    PS. I properly broke in the brakes, followed procedure, and have roughly 1500 miles on the truck now. I had no emergency braking needs, nor do I ride the brakes, etc which might cause braking issues.
     
  2. May 29, 2017 at 4:22 PM
    #2
    Signalguy

    Signalguy New Member

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    Hi
    I have the same issue with my 2014, I took it to the dealer and they said it all was fine. However in a couple of panic stops I had to do the brakes actually lock up momentarily but by the time they do that I'm already off of them. I don't know what the cause is, software maybe? Power assist issue?
    For the record I don't like antilock brakes.
    The feeling to me is that the longer your foot is on the pedal the more braking force is applied, it is not "linear" in feel when brakes are applied.
    To me this is very annoying.
    Steve
     
  3. Jun 1, 2017 at 8:18 PM
    #3
    WTW15

    WTW15 New Member

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    Wondervu, Co
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    TRD black wheels, leveling kit, NFab nerf bars with steps, garage life at 9,000'.
    Oh Thank Goodness - I thought after all my years of driving, I was losing my finesse. Glad to know it's "IT" and not ME. :)
     
  4. Jun 2, 2017 at 8:11 AM
    #4
    MeefZah

    MeefZah Curmudgeonly

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    Things with stuff, but nothing much
    This is normal. There's a combination of issues, including a brake assist feature, and the much discussed front end dive when braking, that contribute to this.

    Replacing the front struts helps with the front end dive. The brake assist you just adapt to.
     
    jester243 likes this.
  5. Jun 2, 2017 at 7:47 PM
    #5
    JBTRD

    JBTRD Hunting, Fishing, Lovin' Everyday

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    I have noticed it, but i thought it was just me. But i am use to it by now and i do it to all vehicals i drive.
     
  6. Jun 7, 2017 at 6:42 AM
    #6
    j cat

    j cat New Member

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    when I purchased MY 2016 SR5 in july of 2016. I did not like the vehicles brakes. I did comment on the brake dive... so after a few hundred miles I had to stop quickly and what happened was the front brakes locked up as I gradually increased brake effort then the rear of vehicle started to swing around . the rear brakes never came on .... so I also observed that brake dust was on the front wheels but not much on the rear .. So I bled the rear brakes and I was shocked to see a load of air bubbles flowing out my clear bleeder hose on the rear calipers ..

    After that bleeding no problems , brakes as it should .. I have twice had to brake hard and all four wheels braked evenly and NO control problems. vehicle now has 8K miles ..
     
    liftbikerun [OP] likes this.
  7. Jun 7, 2017 at 6:50 AM
    #7
    fajitas21

    fajitas21 New Member

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    16k miles here. Mine doesn't do that. Dive was fixed by new suspension, but brakes have always performed well. It's worth investigating J Cats idea of making sure there's not air in your brake lines, because either I've gotten used to how it does and don't notice it, or mine doesn't do it. I'm really not sure. The only way to know is to drive someone else's I suppose.
     
  8. Jun 7, 2017 at 11:59 AM
    #8
    j cat

    j cat New Member

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    driving the GM truck it is the opposite of the toyota brakes .. you hit the GM brakes too hard ABS comes on that means NO braking it will pulse on/off.. toyota brakes you push past a certain point and that damn brake pressure pump starts pumping and all the brakes lock up ...
     
  9. Jun 8, 2017 at 4:41 PM
    #9
    jbrandt

    jbrandt New Member

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    I've noticed that brake dive is especially touchy on these things, and I'm fairly certain it's because of the massively soft, boat-like shocks that come on the non TRD 4Runners. The brakes are a little touchy and have a fairly soft feel, which exacerbates the problem, probably because I'm used to the heavier feel of my 2004 Tacoma.

    Get yourself some Bilstein 5100's and that will more than likely take care of a lot of that issue.
     
  10. Jun 8, 2017 at 5:56 PM
    #10
    fajitas21

    fajitas21 New Member

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    I did a 2" lift with Bilstein 5100s and the dive is 80% better. The other 20% is because I went OME 884 and I probably should have gone OME 885.

    But seriously, it's so so much better, and body roll is greatly improved too.
     
  11. Jun 11, 2017 at 11:36 AM
    #11
    allthescottsweretaken

    allthescottsweretaken New Member

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    I wish
    I have a stock 2016 Trail Premium and have the same issue.

    If you want the physics answer... the kinetic energy of the car and rotational energy of the wheels drops exponentially as the car slows down, so break force actually needs to be reduced as you slow down in order to keep deceleration linear. Its been a while since I went to college though so I'm sure there's more to it than that.

    Why this only manifests itself in a 4runner so noticeably compared to every other car I've owned is another issue I guess. Surely the soft suspension and spongy brakes don't help. I'm planning on swapping the suspension, and now that I've been on this thread I think I'll bleed the rear brakes too. I did have the rear end come around on me doing some heavy braking on a dirt road the other week...
     
  12. Jun 11, 2017 at 12:19 PM
    #12
    j cat

    j cat New Member

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    use a clear vinyl hose when you bled the brakes .. I in the past did not many years ago , so what happens is the bubbles are not revealed , as it only takes a few small air pockets to mess up the braking effort.

    just did brakes on a Dodge put on slotted rotors ...brakes did have some air bubbles .. 2013 challenger. no leaks but it did have air in the fluid ...owner is very happy now..
     
  13. Jun 11, 2017 at 3:20 PM
    #13
    JBTRD

    JBTRD Hunting, Fishing, Lovin' Everyday

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    I own a trail, and the stock prius shocks it came with were awful. They rolled on turns and, dipped down on slight braking. Bought the TRD Pro shocks massive diffrence. Just the brakes being inconsistent is something i have gotten used to.
     
  14. Jun 17, 2017 at 1:27 PM
    #14
    AZ4walker

    AZ4walker New Member

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    Mine takes more effort to keep from creeping forward at stops, much more than the 2016 Tacoma I traded. I catch myself creeping while not paying close enough attention, maybe my leg muscles are just getting weaker, lol. I'm going to jack up the rear and see how well the brakes in back are grabbing.
     
  15. Jun 17, 2017 at 3:55 PM
    #15
    liftbikerun

    liftbikerun [OP] New Member

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    This 100x's as well. I've almost rear ended people 3 times because of it. I usually can rest my foot on the pedal, I have to adroapp push and sustain that force to keep the 4R stopped....
     
    AZ4walker likes this.
  16. Jun 20, 2017 at 10:50 AM
    #16
    jbrandt

    jbrandt New Member

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    I've totally noticed that too!

    I don't think it has anything to do with the brakes not functioning properly, though, it's just that the light touch on the pedal means your foot is more likely to relax slightly. My brakes work perfectly fine.
     
    Last edited: Jun 20, 2017
    AZ4walker likes this.
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