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Thread: Brake temperature and lock of wheels

  1. #1
    Kart Driver
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    Brake temperature and lock of wheels

    Hi,

    I've got a quite strange problem after some laps with some cars (indycars in oval, some gt3 or old prototypes). Basically, even if brake temperatures seems ok (2-300C) and ducts are open (100%), the brake temperature (mainly the front) start to rise during acceleration, and the car begin slow down (it seems that the wheels are locked). No way to reduce temperature after this event... the car is slow for tens of seconds, I need to just stop the car. This problem also occour in indycars/oval: even if temperature is low (about 150C), just a sideslip can mess the race due to this problem. Never happen with LMP1/LMP2 (the most used cars by me).
    Thanks for any help.
    Last edited by sparviero1978; 08-06-2019 at 12:01.

  2. #2
    LMP2 Pilot hkraft300's Avatar
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    Reduce brake pressure. GT3/E, vintage and indy cars have steel brakes. Their operating range is from cold up to ~650c when the brakes lose power. At 100% brake pressure, the brakes have more power than the tyres have grip. So the tyres will slide at full brake.
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  3. #3
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    I set brake pressure at 50%. Temp did not rise too much, but I still have problem at 270-300C (porsche 911 gtr): temp rise during acceleration and speed decrease... to stay below 250 C, I have to coasting instead of breaking, is it normal?

  4. #4
    LMP2 Pilot hkraft300's Avatar
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    Yes.
    Stay below 650c is fine. 250c is too low.
    G29 FFB RAW 100-40-5-10

  5. #5
    Superkart Pilot Eric Everfast's Avatar
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    Is the Formula A steel or ceramic brakes?

    I was racing Road America and after 8-9 laps the rears were overheating which made me experience noticeable brake fade in the corners after the long straights. With the telemetry on, the rears were hovering around 550C after a few seconds on a straight which would imply that they probably soared up to 700+ in the hard braking zones.
    GT Planet username: Kart_Forever

  6. #6
    LMP2 Pilot hkraft300's Avatar
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    Quote Originally Posted by Eric Everfast View Post
    Is the Formula A steel or ceramic brakes?
    Carbon. You could be hitting >1200c in a braking zone.
    G29 FFB RAW 100-40-5-10

  7. #7
    WMD Member PostBox981's Avatar
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    Are you guys sure your pedals calibration is working alright? To me that sounds like you are slightly braking all the way, maybe you need to adjust a little leeway (maybe 5%) to the brakes to keep them from permanently braking.
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  8. #8
    LMP2 Pilot hkraft300's Avatar
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    Quote Originally Posted by PostBox981 View Post
    Are you guys sure your pedals calibration is working alright? .
    Yes. When I really stomp on it (and have reasonable brake ducts) I'll get FA and prototypes to that temp.
    I keep them open enough to avoid that though, or the tyre pressures get a bit crazy.
    G29 FFB RAW 100-40-5-10

  9. #9
    Superkart Pilot Eric Everfast's Avatar
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    Quote Originally Posted by hkraft300 View Post
    Carbon. You could be hitting >1200c in a braking zone.
    Interesting. I feel like the brakes are operating just fine for the first 6-7 laps of the race at temps that would imply that they're steel. Tires are up to temp between 80-90C as well and I have the ducts opened at 35% only
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  10. #10
    Superkart Pilot Eric Everfast's Avatar
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    Quote Originally Posted by PostBox981 View Post
    Are you guys sure your pedals calibration is working alright? To me that sounds like you are slightly braking all the way, maybe you need to adjust a little leeway (maybe 5%) to the brakes to keep them from permanently braking.
    I'll double check tonight. They should be calibrated correctly though
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