bidirectional manner with the electronic measurement unit therefore a mass produced product can likewise be employed for the radio interface and therefore the mobile measurement device according to disclosed embodiments can be realized in a technically simple manner the portable control terminal which may be designed in this way should transmit only the control commands for the execution of a brake test by the measurement unit itself in the direction of the electronic measurement unit this means that the brake test runs on the electronic measurement unit and also that the measurement data should be evaluated within the electronic measurement unit the portable control terminal may optionally receive from the electronic measurement unit the obtained measurement results which can be displayed on the control terminal or else can be stored in the control terminal to later further process the measurement results in some other way or to archive or print out the measurement results at least one pressure sensor may be connected to the input end of the electronic measurement unit which is intended to be positioned close to the rail vehicle the pressure sensor detecting the pressure in the main air line hl at least one further pressure sensor for detecting the associated brake pressure and at least a third pressure sensor for detecting any control pressure in the region of the control valve or the feed pressure.