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Stiff Brake Pedal when Starting Car in Morning

Discussion in 'Model S: Driving Dynamics' started by rknp85plus, Sep 15, 2017.

  1. rknp85plus

    rknp85plus Member

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    I recently bought a CPO 2013 Tesla Model S P85+ and every time I start the car in morning the brake pedal is super stiff, like a rock, and then it lets up to regular brake pressure. This only happens when I leave it overnight. I brought the car into the service center and they replaced the brake booster but this did not resolve the problem. I brought it in a second time and they are now telling me this is "normal" for my model year. I drove 4 Tesla loaners for a total of 4 months prior to this and none of them did this. Has anyone else experienced this? Is there some sort of leak in a brake system that is causing it to lose pressure overnight? Thanks!
     
  2. Randaddy

    Randaddy Member

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    My 2013 P85+ brake pedal feel is consistent. Definitely not normal for the pedal to be stiff in the morning.

    Peculiar issue since I assume they bled the system when replacing your brake booster.
     
  3. rknp85plus

    rknp85plus Member

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    Thanks for the reply. I am starting to get the feeling that they either do not want to fix it or they have no idea how to. Just wanted to see if another owner with the same vehicle model had the same issue.
     
  4. The Duke

    The Duke Member

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    Stiff as in it takes a lot of pressure to brake, or stiff as in you cannot move the pedal, even when stopped.

    If you have to apply a ton of pressure when the brakes are cold, it could be pads. Someone replaced them and they need to be warm to work. High temperature pads are not uncommon as people will buy racing equipment even when it's worse for their application. If this is the case new pads will regain the feel.
     
  5. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

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    My 2013 S has consistent feel. Hard as a rock in the morning is definitely not normal. I'd do two things.

    First: Every time this happens press the voice button and say "Note. The brake pedal is really hard right now." "Note" is the keyword to send a timestamped message to Tesla so they can correlate the logs. After you complete the message, if it succeeds you'll get a "thank you" response.

    Second: Write a polite letter to Tesla Corporate explaining the problem. This method has been known to help others. One of the issues Tesla has is that they get their service people from the same pool of people who work at a regular car dealership. This means that some, certainly not all, of them have a "say whatever it takes to get the customer out the door without us taking time to actually diagnose the problem" reflex.
     
  6. Musterion

    Musterion 18h 03m 37s −24° 23′ 12″

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    I have 2013 S85 and have exact same behavior since beginning. Long ago mentioned it to service center (at factory) and they reviewed it and said it was normal behavior and is only there when starting car after long time sitting. In fact after pushing pedal first time, brake pedal behaves normally for all driving. But it is true that newer builds do not display "morning stiffness" -- older is better sometimes and you have a lot of gems on your car that have disappeared since 2013.
     
  7. bishoppeak

    bishoppeak Member

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    If it stays stiff over 4 hours go immediately to your service dept(Sorry, couldn't resist)
     
    • Funny x 2
  8. rknp85plus

    rknp85plus Member

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    Stiff as in it feels like there is a rock stuck behind the pedal. There is maybe about a couple of centimeters of give. Once I pump the brake to start the car, pressure goes back to normal. Happens every morning like clockwork.
     
  9. rknp85plus

    rknp85plus Member

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    I know, I was thinking it too.
     
  10. rknp85plus

    rknp85plus Member

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    Thanks for the advice! Looks like I may have to write a letter. They are definitely giving me the "run around" vibe just to get me to go away and not fix the problem.
     
  11. rknp85plus

    rknp85plus Member

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    Thanks, you are the first to have the same experience. There are a lot of other members with our same make and model that do not have the same experience. So frustrating.
     
  12. Musterion

    Musterion 18h 03m 37s −24° 23′ 12″

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    Yes I'm also interested in what others chime in since there are conflicting reports from same vintage.
     
  13. cab

    cab Member

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    I'm pretty sure I experience the same thing (although perhaps not every morning). I'm pretty sure it has to do with some amount of boost bleeding off. I've experienced this on other cars too (i.e. I believe our Honda does this sometimes too). I sort of wonder if it is at all tied to any application of the brake pedal once the door opens when you come to a stop the night before. As it never affects the actual braking, I'm not worried about it.
     
  14. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

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    FWIW, my car is parked on a slope at home (car faces downhill) and so the brake pedal gets pressed somewhat hard every day. The pedal travel is always normal in the morning.
     
  15. cab

    cab Member

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    If you guys still have a gas powered car, you can probably simulate the same thing. Start the car, hit the brakes once. Turn it off. Now pump te pedal a few times. It will likely het progressively stiffer.

    A sticking caliper and/or bad booster can cause similar feelings.
     
  16. JPP

    JPP Active Member

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    My 2013 S85 does this every morning. I attribute it to the brake booster bleeding off. Note that older builds (2013-2014) have an old fashioned 'mechanical' brake booster, and this is why there is no true hill hold on these models. Once the electrically powered brake boosters appeared (?2015-like my wife's S70D), then true hill hold appeared, and also the morning 'hard pedal' disappeared.
     
    • Like x 1
  17. SSedan

    SSedan Member

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    My new to me P85 does this if it sits 24hours but not at 14 hour overnight. Not sure where the break point is but a typical day get home from work park it leave for work the next morning is normal. Get home from work and doesn't leave again till Saturday afternoon and it is firm till you turn the car on.
     
  18. MP3Mike

    MP3Mike Active Member

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    I'm sure it is a vacuum leak, and there should be a couple things to leak:

    * Brake booster (they already replace it right?)
    * Vacuum hose between pump and booster.
    * Vacuum pump (So this is most likely the problem.)
    I don't think there is anything else run by vacuum in the car, so that should be it.
     
  19. oktane

    oktane Active Member

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    Mine is also stiff in the morning but I thought that was normal?
     
  20. William13

    William13 Member

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    Signature P85 here. When brand new this did not occur except when unused for a week. Slowly this phenomenon occurred more quickly. Mine occurs if left 12 hours or so now. As mentioned above it is a slow vacuum leak. No worries. Remember every time you take a car in you have a chance that something will be broken. Also you must exchange cars and use free time of your own. This will not cause an accident or cause more than two seconds of time delay daily.
     

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