The invention relates to a device for monitoring the position and displacement of a brake pedal. The aim of the invention is to enable the monitoring of a pressure-rod plunger during a vehicle-dynamics control operation. To achieve this, the magnet (35; 150) is positioned between two plungers (2, 3; 105, 106) and can be displaced in relation to at least one of the plungers (2, 3; 105, 106). This facilitates a relative displacement of the magnet (35;150) in relation to a stationary plunger (3; 106), in addition to a proportional displacement of the magnet (35; 150) in relation to an actuated plunger (2; 105), when the plunger (3; 106) cannot be displaced in relation to the housing (6; 103) as a result of closed block valves, in a braking operation during a vehicle-dynamics control operation.