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Brakes noises

Discussion in 'Roadster: Technical' started by Mitrovic, Jan 12, 2011.

  1. Mitrovic

    Mitrovic Member

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    First let me introduce myself briefly:

    After my first drive of a Tesla roadster in spring 2010 I finally got my Roadster Sport Signature edition last week. It has 6000 Km on the clock and was first registered 2.2.2010.

    Tremendous fun, so far! ( 700 Km ).

    One concern however are the brakes. When I leave the car over the night in the garage, when trying to start, the car feels like stuck and only after a little bit more push on the pedal moves with a sudden motion. But then there is terrible high pitched noise from the brakes, and the feel like they have not released. After some 50 meters everything is normal

    The Tesla man here in Switzerland tells me this is normal after a wet drive.
    I doubt this can be normal at this extent.

    What do you think?

    Best regards

    Zoran
     
  2. ChadS

    ChadS Petroleum is for sissies

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    Welcome!

    I get something very similar, though I don't think quite as bad. If I leave my car overnight after a wet drive, the car does feel slightly "stuck" at first, but not much power is needed to get it moving. Then it makes squealing noises for 30 meters or so--very noticable, but not so bad anybody's going to look at the car with alarm. I do not notice the brakes gripping at this point.

    I believe somebody on these forums suggested that this is more likely with Tesla than most cars because the brake rotors get used a lot less, so water is less likely to get wiped off by brake pads, or evaporated by heat.
     
  3. stenkb

    stenkb Roadster 938 Model S 5957

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    Hi Zoran,

    That is normal for me as well. I am not sure exactly - but seems like when I park after washing it or when it gets wet - the brakes rust up a little and this causes them to stick and make that high pitched noise. I am not sure - but that is my guess anyways. The sound usually goes away shortly after as the rust is worn away.

    Kevin
     
  4. Kevin Sharpe

    Kevin Sharpe Active Member

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    Are you using the handbrake or just leaving it in park?
     
  5. Mitrovic

    Mitrovic Member

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    Wow, thank you for the very fast responses! This is a fast community!

    First I used the handbrake but then I left it without the handbrake. No difference.

    Any suggestion how to make things better?

    Zoran
     
  6. stenkb

    stenkb Roadster 938 Model S 5957

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    Don't get it wet?
     
  7. Doug_G

    Doug_G Lead Moderator

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    I'm with Kevin - that works.

    In my experience, the noise only happens the first time I apply the brakes. Rarely it will really squeak but usually it's just a faint raspy noise. I've only had it get "stuck" once but that was after I parked it for two weeks.
     
  8. kgb

    kgb Member

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    I have the same problem, but I didn't make the wetness association, until now. I have to back out of my driveway every morning and most mornings my brakes squeak. But now that I've seen this thread, I realize my brakes don't squeak everyday. I initially attributed the squeak to the fact that the Roadster is Tesla's first try at a car, but now I'm changing my opinion to that fact that I rarely use the brakes, so they never dry off after being splashed.
     
  9. mpt

    mpt Electrics are back

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    +1

    It's rust on the disks/rotors. If you want to induce it, wash the car, put it away and next morning it'll be stuck. If you look before you set off you'll see the familiar reddish hue to the disks.

    I understand that the problem is exacerbated by the racing calipers, big pads and high iron content in the disks.

    And welcome to the Club Mitrovic!
     
  10. Doug_G

    Doug_G Lead Moderator

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    I think this is a problem to some degree with all brakes ever since they banned asbestos pads. The first car I had with with non-asbestos pads was terrible. If they got wet and sat for an hour, they would SCREEECH so loudly pedestrians would jump. Quite often the rear brakes would also lock up solid with just a light touch, so it would look like I was doing a panic stop, which I found also had the effect of scaring pedestrians. The worst was when only one of the wheels locked, and then the car would lurch sideways suddenly, which was alarming and potentially dangerous in winter driving conditions.

    Since that time the automotive vendors have learned how to deal with all this, but the solutions are not perfect.
     
  11. mpt

    mpt Electrics are back

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    Wow, I think you've just stumbled upon the solution to artificial pedestrian warning noises in EVs, just fit noisier brakes.
     
  12. Kevin Sharpe

    Kevin Sharpe Active Member

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    Last weekend I drove out of the garage and instead of the usual sharp 'snap' I heard a 'crunch' and after a feet feet the car stopped dead. At first I thought this was a sticky handbrake but on investigation I found that both rear brake pads had separated from the metal backing material and were stuck solid to the discs.

    Tesla were fantastic and within an hour I had an engineer on site to confirm the fault and request a recovery vehicle to move the car the few feet back to the garage (both rear wheels were locked solid). This was followed by a senior tech visit first thing Monday morning, and then replacement of the discs and pads on Tuesday morning.

    Tesla said that they had never seen this before (they occasionally get disc problems apparently) and I know the guys well enough to trust what I'm being told. They took the parts away for review by the manufacturer.

    I'm not sure what to make of this whole thing… I make a conscious effort to use the brakes when I'm a mile or so from home (to help 'dry' them) and I don't use the handbrake when parked in the garage.
     
  13. strider

    strider Active Member

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    #13 strider, Jan 12, 2011
    Last edited: Jan 12, 2011
    This problem is either caused by pad/rotor content or vibration between the caliper and pad. To fix the first all you can do is try a different pad. I've used these on all my sports cars: http://hawkperformance.com/performance/hps.php Not sure if there's a fitment for our cars as I've only had mine 10 weeks. But an easy solution for the second is to apply some high temp brake grease to the back of the pads.
     
  14. dsm363

    dsm363 Roadster + Sig Model S

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    I always thought this had something to do with the brakes not getting warmed up yet but not sure. I have the same thing.
     
  15. cinergi

    cinergi Active Member

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    I've had this experience with most of my cars -- rotors are wet, rust, and the brakes are a little locked the next morning.
    On the other hand, I've had some crazy loud low-pitched squeaks coming from the brakes below 10 MPH after I've been driving it around. It usually only lasts 5-15 seconds. Not sure what that's all about -- it's a noise I've never heard from any brakes before, especially at such a low pitch.
     
  16. Mitrovic

    Mitrovic Member

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    Thank you to all this input!
    So I guess it is to a certain degree a normal thing. That is reassuring.
    I will try to make some braking ( first I did write "barking" - no I will not do that ) just before I put the car in the garage!

    Thank you for the help! I'm enjoying my Tesla so much!
     
  17. Equity

    Equity Member

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    I'm not Roadster owner but maybe when it's wet outside you should use your brakes more just before you intend to finish driving.
     
  18. SByer

    SByer '08 #383

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    I find that even when doing that, it still happens. I've also found that backing up at a reasonable pace and then applying the brakes just enough to get one or two go-rounds on the discs does the trick for the most part, even after sitting for a weekend.
     
  19. Doug_G

    Doug_G Lead Moderator

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    Right now every major and not-so-major road in the city is dry. Residential streets are another matter; the one in front of my house is covered in wet snow. So it's gonna be wet no matter what I do.

    Honestly it's a non-issue for me. As SByer said, if I simply stop the car after backing out of my garage, the brakes are clean.
     
  20. Mitrovic

    Mitrovic Member

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    Now I brake 2 to 3 times hard before I pull in the garage. And there is no more problems with the brakes. Thank you!
     

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