Brakes? Who needs brakes? That's what walls and people's ankles are for!
[EDIT] Actually, in the little chart (right under the picture of the motor with trans attached), it does say "brake" in the operation row. Not too sure what that means given the ad's odd wording about reverse...
[EDIT2] After reading a little about CVTs in general and the form factor of this transmission, it seems that this must be either toroidal or the "ball type" (similar to toroidal). Either way, I would question the sturdiness of such a thing, and how it would hold up to BL torque...