There are 2 switches on the brake pedal as you found, one is the stop lamp switch and one is the brake pedal position switch. Both connect to the ECU via the BCM and it's not 100% clear which switch controls which function. For example pulling the stop lamp fuse disables the brake lights but also disables the throttle cut. The other one might be used for the park lock and start enable but that's just a guess.
I would test both brake switches with a multimeter for resistance.
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