Urgent Help!!! Braking problem with Prius 2010

Discussion in 'Gen 3 Prius Main Forum' started by mohammed khan, Apr 19, 2016.

  1. mohammed khan

    mohammed khan Junior Member

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    i am from fiji islands in the pacific and had recently bought a japanese second hand prius 2010 (3rd generation) from a local dealer. it has been 3 weeks and i noticed that sometimes when i am trying to brake while coming down a hill or on a rough road the brakes sort of loosen up and the car travels further and then brakes. i find the car accelerates while i am pressing the brake pedal.

    i did some research and found out there was a recall for prius 2010 regarding a problem with the regenerative braking system a software glitch. any ways i am a bit worried and wanted some help as to how to solve this issue can it be a defect or something else.

    feedback will be highly appreciated.
     
  2. bisco

    bisco cookie crumbler

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    that's your vsc kicking in because it detects the loose pavement and thinks you're slipping. just press harder on the brakes. there was a software flash to make it a little less noticeable. it's usually worst around 6 mph when the car is transitioning back and forth from regen to brake pads.
     
  3. mohammed khan

    mohammed khan Junior Member

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    what does vsc stands for. and why does it instead of slowing the car down accelerates it or makes the brake less effective. as i noticed if i am coming down a hill and braking all the way down and if the car meets any port holes than that happens the brakes sort of lets go
     
  4. Mendel Leisk

    Mendel Leisk Senior Member

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    Any warning lights?
     
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  5. zak.kapoor

    zak.kapoor Junior Member

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    I had a similar problem with my 2008 Prius.

    It turned out that the brake caliper pins were dry and hence brake pads were not engaging properly. Cleaning and lubricating the caliper pins solved the problem for me.
     
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  6. mohammed khan

    mohammed khan Junior Member

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    no not the the moment no warning lights show up it just happens all of a sudden
     
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  7. bisco

    bisco cookie crumbler

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    vsc = vehicle stability control
     
  8. Mendel Leisk

    Mendel Leisk Senior Member

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    We've had the brakes go into "fail safe" mode, first sensation is partial loss of brakes. But there's also a batch of brake lights, and sometimes "check hybrid system" warning.

    Still, might be something similar. The brakes work, but they're less responsive, hard to describe.
     
  9. mohammed khan

    mohammed khan Junior Member

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    do all prius 2010 model have this. how can i find out if mine has it. any form of indicators for it as i believe mine doesn't have it. please assist
     
  10. bisco

    bisco cookie crumbler

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    don't know about japanese models, is it in your manual? i think when you pres the power button, the vsc letters should light up for a second, while the car does it's self check.
     
  11. mohammed khan

    mohammed khan Junior Member

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    yes exactly thats what i am facing a t the moment. sensation as in partial loss of brakes and less responsive when on rough road or when going over a bump. how can it be resolved please

    what sort of symbol am i looking for for vsc during start up. the manuals all in japanese so really hard to figure it out sorry for sounding such a dummy
     
    #11 mohammed khan, Apr 19, 2016
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  12. bisco

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    sorry, i'm a dummy when it comes to japanese. no idea what it would look like. you should try some experimentation on the rough roads when it's quiet, so you can get a feel for what is going on, when not in a panic situation. we have a lot of people complaining about this on gravely roads.
     
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  13. mohammed khan

    mohammed khan Junior Member

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    thanks for your feed back. what does the symbol look like in your prius if i may ask. do you think is it still safe to drive long distances or keep up the normal driving if i am facing this problem

    just checked my prius does have the vsc symbol when it starts up(vehicle with skid marks type symbol the one attached below
     

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    #13 mohammed khan, Apr 19, 2016
    Last edited by a moderator: Apr 20, 2016
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  14. alanclarkeau

    alanclarkeau Senior Member

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    You say that you've just bought the car - do you know if it's been undriven for a while? Maybe there is a build up of rust on the disks or, as mentioned above, on the caliper pins.

    Have you applied the brakes hard on a good road to see if they work correctly - it has ABS, and it may feel a little unusual braking hard if you're not used to ABS intervention.
     
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  15. mohammed khan

    mohammed khan Junior Member

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    i will take your advice and get the disks also checked. as i believe it was not driven for a wile and was parked in the dealers yard
     
  16. bisco

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    vsc with skid marks is correct. you can remove rotor rust by putting the car in neutral on a quiet road around 30mph, and gently applying the brakes.
     
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  17. Mendel Leisk

    Mendel Leisk Senior Member

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    I took to dealership, they hooked up to Techstream and reset the system, dismissed codes, car then behaves normally. They're not sure of the cause, but latest time, they thought it might be my Scangauge being hooked up, but not sure. I'm trying driving without ScanGauge, so far no issues.

    Still, if you're not getting warning lights, not sure, maybe applicable.
     
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  18. Former Member 68813

    Former Member 68813 Senior Member

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    i had that too. it was caused by OBD2 reader plugged in. There was malfunction lamp and regen braking was turned off. the code was U..... , loss of communication, forgot the exact number. i restarted the car without the reader and everything was well.

    the OP clearly has a different problem. sounds like the loss of braking issue prius was recalled in 2010. maybe the foreign markets didn't get the recall?
     
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  19. mohammed khan

    mohammed khan Junior Member

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    "i restarted the car without the reader and everything was well. " what do you actually mean here. u mean restarting the electronic systems software or soemthing
     
  20. ChapmanF

    ChapmanF Senior Member

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    If I'm reading this thread right, all the OP seems to be talking about is the same thing Priuses have always done, my 2001 does it. I bought it in 2008 and, thanks to PriusChat, I had already read about it and knew what to expect before I experienced it the first time. (In fact, based on what I read on PriusChat, I took my car out on a rough road and made it happen, to get used to the feeling so it wouldn't startle me in normal driving. Eight years later it still happens under the right conditions on the right road surfaces, and it still doesn't startle me.)

    The Prius has two entirely different ways of braking, one by repurposing the electric motor as a generator, and the other a normal brake system at all four wheels. The regen braking can only use the two front wheels, which could be a problem with poor road traction. So any time it detects any sign of traction problems, it gives up on the regen braking and goes straight to the hydraulic system, with which it has control of all four wheels.

    The switch isn't perfectly seamless though, the regen braking is already cut off (remember, the car was worried about traction) and it takes a split second to bring the hydraulic brakes into full action. During that split second, you are not slowing at the same rate you wanted. No matter how it may feel, the car has not literally decided to go faster ... it's just a momentary drop in the rate of braking. (To the seat of your pants, there's no way to tell a "reduced rate of braking" from "forward acceleration" from a change from downhill to uphill ... with your eyes closed they'd all feel the same.)

    All that said, even though this has been a long known Prius quirk since the earliest models, there were reports that the original 2010 software had a longer transition time that bothered more people, and so Toyota had an update for that model. It doesn't make the whole transition moment go away or make the car not a Prius, but reportedly it makes the transition time shorter, probably more like the earlier models. So you could check whether that update has been done.

    -Chap
     
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