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Originally Posted by Billfred
Basically, when you turn a motor with your hands (assuming no worm gears or other stuff gets in the way), you're creating electricity. What the brake function does is create a short circuit for the motor. Thus when you turn the motor, the electricity it generates is used to counter your rotation.
If you want a really simple example, get a Lego motor and some wire. If you put the wire on right, that axle should hold like the Lake Murray Dam.
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use a new "old" lego motor. the "new" motors are geared down. and old "old" one like mine... like 10yrs old loses its efficiency so it wont work too well
[edit]nvm. it doesnt matter if its geared or not. just dont backdrive it enuf to damage it.[/edit]