The entire brake light system has, at best, one fuse. In fact, the fuse that the brake light current flows through probably feeds more than just the brake lights.
If the same filament is used for brake light and turn signal, the power to the brake lights goes through the turn signal switch. When turning, the brake light power is disconnected from that light by the TS switch, and the flasher is connected to that light instead. So a bad TS Switch can fail to reconnect the brake light power to that light.
If there is a separate light or lens for the TS and the brake light, that doesn't apply.
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