Abstract: A detection method for detecting the blocked or unlocked state of a parking brake member including a bistable linear electromagnet (1) connected both to a power supply component (14) arranged to generate a control voltage (Uc) and also to a current sensor (15) arranged to measure the control current (Ic), the detection method comprising the steps of: controlling the power supply component (14) to generate a test voltage (Utest) across the terminals of the coil and thus generate a test current (Itest) flowing in the coil, the test voltage having an amplitude less than a predetermined voltage threshold so that a test magnetic field generated by the test current does not move the shuttle; acquiring measurements of the test current as produced by the current sensor (15); and analyzing the measurements of the test current and detecting the blocked or unlocked state of the parking brake member on the basis of this analysis.