Method and device for carrying out a brake test for trailer vehicles

The method involves sensing a semitrailer or a trailer newly hitched to a towing vehicle. An on-board brake test for a brake system of the semitrailer or trailer is initialized. A defined braking process is initiated by the brake system after a defined driven distance. A braking effect of the defined braking process is sensed and determined as a braking effect actual value. The actual value is compared with a present braking effect setpoint value. An information signal is output by considering an evaluation result based on the comparison. An independent claim is also included for a device for performing a method for carrying out brake test on a trailer vehicle and a semitrailer vehicle.