PARKING BRAKE SYSTEM, COMPUTER-IMPLEMENTED METHOD OF CONTROLLING A PARKING BRAKE SYSTEM OF A RAIL VEHICLE, COMPUTER PROGRAM AND NON-VOLATILE DATA CARRIER

A parking brake system for a rail vehicle () contains a brake actuator () for receiving a parking-brake command (cmd) and producing an electric brake-force signal (BF). A brake unit () contains first and second pressing members () and a rotatable member () being mechanically linked to a wheel () of the rail vehicle (). When receiving the electric brake-force signal (BF), the brake unit () causes the first and second pressing members () to apply a braking force to the rotatable member () to keep the wheel () immobile. A gear assembly () in the brake unit () operates mechanically on the first and second pressing members (). In response to the electric brake-force signal (BF), an electric motor () acts on the gear assembly () to cause the first and second pressing members () to attain a specified position interrelationship. An acceleration sensor () registers movements of the rail vehicle (). If movements of the rail vehicle () above a magnitude threshold level are registered during a period when the parking-brake command (cmd) has instructed the at least one wheel () to be immobile, the brake actuator () reproduces the electric brake-force signal (BF) to reapply the braking force to the rotatable member ().