Unsolved What number should I aim for brakeDiameter?

Discussion in 'Mod Support' started by ProgUn1corn, Sep 28, 2025.

  1. ProgUn1corn

    ProgUn1corn
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    Joined:
    Apr 29, 2020
    Messages:
    28
    Hi, usually the diameter is just disc diameter, like 355mm disc you would enter 355 in the brakeDiameter. However after the 0.37 update with brake glow, I've found that it's not always the case with brake thermals.

    I'm building a rally car with 355mm x 32mm disc in spec. Looking at real footage, when the brakes glow (>600c), they hold that glowing status for quite a long time, even that's with brake duct cooling in the front or it's as cold as monte carlo.

    However in BeamNG, when I enter 355mm in the brakeDiameter, the brake will almost never reach 600c and they cool down extremely fast. This is because I guess in real life you have something called PCD for brake discs, not all 355mm diamter of a disc is used for cooling, there are only maybe 145mm to 155mm diameter of actual brake disc area that is for cooling.

    I've found some examples with the right amount of mass entered, now the discs indeed can hold the glow for a while, but they store too much of heat - when the brakes go over 600c, they almost never cool down to below 600c now.

    Moreover, my brake bias is set like 63% front, but the rear brakes keep heating up eventually it's actually hotter than front brakes, which is very uncommon on a tarmac rally car.

    Is there anything wrong with my numbers? I wouldn't consider brake fade a thing as it goes above 600c for just 2 min of driving. I guess Italy has a environment temperature of 27c is too hot for this situation?

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