PLAYING ON EXP 2.1.9 (latest version as of posting this)

cannot change the Car's Break Force KW value without getting this error

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{Error while loading entity prototype "car" (car): Value must be a number in property tree at ROOT.car.car.breaking_force}
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no other mods (or space age) are in conflict, it crashes on its own if I change the breaking force on the Car (other vehicles weren't tested)

I'll take a look, thanks!

This should now be fixed in v1.2.2. The game switched the datatype for that value from an energy value to double so the value you want to put in will be different now.