Brake test system and method for function testing of brakes in railway vehicles

Brake test device has a central brake testing device (1) and an auxiliary unit (10) for connection to the vehicle brakes. The vehicle is connected to the auxiliary connection via a connection (22), while the auxiliary unit is connected to the central unit via a further connection (24). The auxiliary unit includes a piston valve and solenoid for shutting of air supply to the vehicle. The auxiliary unit also includes a pressure sensor. An Independent claim is made for a method for testing rail borne vehicles which allows selection of one of three test functions: leak testing, braking and activating.