a self - locking belt retractor for motor vehicles with a vehicle - sensitive and a belt - webbing - sensitive control system for the blocking arrangement of the belt retractor , is characterized in that for the formation of its inertia , an inertial mass is swivellably mounted on a control disk , wherein the inertial mass can be deflected into a blocking position for the control disc . additionally , a locking lever mounted on the control disc is provided for the cutoff of a vehicle sensor , and by way of a switching process in its cutoff position , the locking lever cuts off the vehicle sensor and secures the inertial mass in a disabling position , the disabling position being different than the blocking position .