The invention relates to a brake disk lock having a receiving gap for the receiving of a brake disk, comprising: a securing section for the closing of the receiving gap, an alarm device for the output of an alarm signal, a movable brake disk recognition device, a pressure switch having a contact element which is movable against the spring force of a first spring means by the brake disk recognition device to activate the alarm device, and an actuation section which is movable out of a release position into a securing position to close the receiving gap by means of the securing section. A second spring means is provided via which the actuation section is prestressed into the release position, with the switch body being coupled to the actuation section via the second spring means, and with the two spring means being matched to one another such that, on the movement of the actuation section into the securing position and on the presence of a brake disk in the receiving gap, the pressure switch is actuated against the spring force of the first spring means and a remaining relative movement between the brake disk recognition device and the actuation section is compensated by the second spring means.