This can be remedied with a simple adjustment of the brake wire. An adjusting nut was added to the cable to be able to maintain the brake should the wire stretch with normal use. The brake pin on your model is sticking out too far and can be brought back in by adjusting the sheath length, the adjuster in the middle of the cable needs to be turned to tighten the brake wire.
- Smart(Pre 2016)/Smart lux(Pre 2016): https://youtu.be/_fdAUosNjik
- Smart V3(2016~ ): https://youtu.be/IQM7y08pddw