The "braking" system consists of a simple strap around the perimeter of the main wheel. This strap can be tightened by a simple "plus minus" dial. Which essentially just tightens the strap. The "strap" after just three months of use by my wife, has shredded. The device is more or less useless without it. Very disappointed with the quality of this machine and should have known better than to buy something so cheap that was just too good to be true. In a word, Crap. Peter.