Does anyone know how much torque is applied by motors in brake mode? Is there a way to calculate this? I am specifically interested in 775 pro motors but the data would be interesting for all motors.

The torque applied is a function of how fast you are spinning the motor. I wrote some detail about how to calculate it here Neo Motor brake force? - #11 by Will_Toth and there is a lot of other useful discussion about it in that thread.

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Thanks! This allowed me to calculate the theoretical max falling speed after the power cuts and we’ll be in the air after 5 seconds!

If you run SysId, you can calculate the braking acceleration as \frac{K_v}{K_a} * velocity. This can save you some steps, since usually you care about acceleration rather than torque.

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