But the question is whether the fan stops throttling? If so, it suggests graphics card/driver issues. This has especially been a thing for some people with NVIDIA. Solutions have ranged to what you see below:
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Uninstalling/resetting graphics drivers. Example 1 Example 2
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Renaming Brave to Chrome.exe and then NVIDIA treated it better
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Disabling or removing certain extensions
The list goes on. But definitely have been a wide range of issues and solutions so far. As stated, usually nothing to do with Brave but instead to do with drivers or settings. It might be easier to go with the first step of reinstalling/resetting your drivers first to see if it helps.