Closed circuit which is almost dust free, when connected to an appropriate Blastrac dust collector. Heavy weight for increased scarifying performances. New braking system with handle. During scarifying, the machine slows down itself. Brake force is easily changed with handle on steer. Extra heavy drum, for more down force. Adjustable braking device, lateral drum loading. Micrometric and memorized adjustment of the working depth: no underground deterioration and more precision. User friendly design, comfortable to use with low vibrations, easy to manoeuvre. Several optional cutting tools for each different application.