Objective: to know the technical characteristics and operation of the safety controls in order to control the vehicle, minimise wear and tear and prevent disfunctioning: specific features of hydraulic vacuum servobrake circuit, limits to the use of brakes and retarder, combined use of brakes and retarder, making better use of speed and gear ratio, making use of vehicle inertia, using ways of slowing down and braking on downhill stretches, action in the event of failure.
