Burning smell from the wheel area

Discussion in 'Gen 3 Prius Main Forum' started by CapnBio, Jan 15, 2017.

  1. CapnBio

    CapnBio Junior Member

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    Is it normal to smell something burning outside in the wheel well when braking hard? I had my windows open and in both cases I braked unusually hard and smelled the burning smell coming from the outside.

    ~ CapnBio
     
  2. Raytheeagle

    Raytheeagle Senior Member

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    How many miles on your Prius? When was the last time a brake servicing was performed? Do you know which wheel or wheels it is coming from? How long have you noticed this?
     
  3. CapnBio

    CapnBio Junior Member

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    Miles on my prius is 56k it's a 2014 III. As far as performing a brake service, never i only had the car for 3 months, I angel it from both front, and I just noticed it yesterday.

    ~ CapnBio
     
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  4. Raytheeagle

    Raytheeagle Senior Member

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    Have you driven the car since braking hard or allowed the brakes to cool? Is the smell still there? When you say brake hard, can you describe this a little( 65 to 0 due to accident in a short distance, 30 to 0 due to stop light, etc.). Did you investigate the front brakes and see if you can visually spot anything?
     
  5. CapnBio

    CapnBio Junior Member

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    More like 40 to 0 from a stop light, and the burning smell does go away after normal driving so they will cool down. I have not investigated the brakes but I put my hand close to the disks and they radiate lots of heat.

    ~ CapnBio
     
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  6. Raytheeagle

    Raytheeagle Senior Member

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    Sounds normal if braking hard. I notice this too if descending a long hill or stopping suddenly.

    Some things to keep in mind or check:

    1) check the level of brake fluid in the reservoir and get an idea of the level. If low it might be an indication that the brake pads are getting low.
    2) at 60 k miles you should have a servicing that should include brake inspection, which will include a pad thickness check. As part of this, you should pull the slide pins and ensure they are lubricated. Clean the pins off and apply some fresh lubricant. This should be done every 30 k miles.
    3) Minimize as best as possible hard braking conditions (try to "Drive ahead " ) so as to reduce the need for friction braking. This will help make the pads last a long time.

    Hope that helps (y)
     
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  7. CapnBio

    CapnBio Junior Member

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    I'll be on the lookout when I service my car, I usually like to do it myself. I'll cork on everything and hopefully keep you updated.

    ~ CapnBio
     
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  8. CapnBio

    CapnBio Junior Member

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    I've also noticed my disks (also with normal driving) gets oxide spots, which I'm guessing is normal from the humidity down in South Florida. It's like seeing if the car has been sitting forever at a dealer

    ~ CapnBio
     
  9. Raytheeagle

    Raytheeagle Senior Member

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    There is a good thread that is a sticky in the Gen 3 Maintenance forum. Has a lot of good videos on how to do many jobs, including the slide pin lubrication.

    If you are a DIY, they come in handy:).

    One job to consider at the mileage you are at would be to change the trans fluid (drain and fill). It is not on the toyota recommended maintenance schedule as it is "lifetime" fluid,but best to change this out. A little more involved than an oil change, but something simple to do that will help extend the life of your Prius. There is a video in the sticky thread for that thanks to @NutzAboutBolts .

    All the best(y)
     
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  10. Raytheeagle

    Raytheeagle Senior Member

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    This is normal. With regenerative braking, friction brakes are used less, so you will see some oxidizing. As you get to know your Prius the more you drive it, the better you will get at minimizing the use of the friction brakes. Our 2010 Prius II has 146 k miles and going strong, when I did the pin lubrication at 142 k miles, here is what the pads looked like:

    Fronts: IMG_0079.JPG

    Rear: IMG_0076.JPG

    These are original pads and should last to at least 250 k miles, maybe longer. We have owned the car since mile 14 and I have learned the benefits of regen braking and how to "drive ahead";).

    All the best(y)
     
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  11. CapnBio

    CapnBio Junior Member

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    Awesome amount of info, thank you very much. I'm also a first time prius owner, I had a Honda insight, but the prius surpasses my expectations.

    Thank you!

    ~ CapnBio
     
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  12. Raytheeagle

    Raytheeagle Senior Member

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    When we were in the market for a car in August 2009, it was between the Insight and the Prius. The Insight was less, but the Prius I felt more comfortable with. 7.5 years later and no regrets:)!!!

    Prius Chat is a great resource for any Prius owner. There have been plenty of things asked in the past, so as you have questions, be sure to search and you'll usually find what you are looking for;). If not, there are plenty of helpful folks here.

    All the best(y).
     
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  13. fuzzy1

    fuzzy1 Senior Member

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    Hard braking is expected to heat up the brakes. The bigger question is, do they heat up without hard braking? That is an indication of dragging pads or stuck calipers, something that should be remedied.
     
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  14. Mendel Leisk

    Mendel Leisk Cloud Watcher

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    How do the rotors look, just looking through the spokes with a good light?
     
  15. BZzap!

    BZzap! Senior Member

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    Without regenerative brakes I would guess that the brakes on the Prius would take a beating. The car is relatively heavy with very small brakes. Under a very heavy brake load I would expect the brakes would get hot very quickly. During hard braking the regen's give way to normal hydraulic brake forces. If the condition persists under normal driving conditions I would consider getting the brake system checked out.
     
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