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master cylinder might not be returning the levers back all the way necessitating a rebuild. That was the case with my front. Are your brake lights on in the rear???
If it's a cable throttle bike the sensor on the cables are wore out. It is for when you roll the throttle forward to cut the cc off instead of hitting the brakes.
Throttle by wire should have something that does the same thing. However, I am not familiar with that.
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