Hello
Thanks! 
I’ve already looked up about it.
But I didn’t see the toe brakes of flight simulation someone made of DIY.
I think it seems very complicated and not to simple. Therefore, I decided to use Gas spring and slide potentiometer as planned.
It is a very small gas spring and has a 30mm stroke. and has a power of 30N.
I don’t know what the real torque of the toe brakes but I think it’s enough power. 
Thanks again!
Best Regards,
Younghoon