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If you have no mechanical issue with the motor (serious cracking noises from the motor and motor hi revving without supporting the bike) I think it’s an electrical problem. Do the brakehandles cut the engine power (for example the Magura 5E braking system)? Could be a problem in the handle...

If the engine isn’t running at all, first thing I would check is if there is supply voltage at the motor (connector on the left side of the motor).You have to remove the left crank (SST) to remove the plastic hood of the motor.

At my work we drive 3 speed pedelecs with Brose Drive TF C93882 motors. All of these motors were replaced at 2500-3500 km, that’s why I think there’s a quality issue with this motor.

Owner of a Brose Drive TF: broke down after 3000 km's ...

Indeed, althoug Dr. Brose seems to be very proud of it!

Remarkable: I think 'Mr. Brose' shows the exact problem of the Brose Drive TF 45km/h motor! Zoom in on the bottom left side of the outer gear ring ...

A new Brose Drive TF (official 45km/h) motor has been mounted on my QWIC Performance Speed MA11 after only 3000 km due to internal mechanical failure. My colleagues motor (same bike/same motor) broke after only 2500km. Another colleague of me has a Specialized Vado with the same motor: same...