Brake system for a motor vehicle

A brake system (1) for a motor vehicle (2), the brake system (1) comprising:

• a first directional control valve adapted as a directional control valve (6);
• a second directional control valve designed as a redundancy valve (7);
• a third directional control valve adapted as a brake valve (10);
• a brake cylinder (14);
• a pressure means source (9);
• an electronic control unit (16);
• a parking lock (24);
• and
• a depressurized tank (T), wherein:
• the control valve (6) and the redundancy valve (7) are mechanically preloaded in a closed state,
• the brake valve (10) is mechanically preloaded in an open state, and
• the electronic control unit (16) configured
• (i) to control the control valve (6) and the redundancy valve (7) in such a way that they move into an open state against the mechanical pretension, whereby pressure fluid can be fed from the pressure fluid source (9) via the control valve (6) and the redundancy valve (7) and downstream via the brake valve (10), which is mechanically preloaded in the open state, into the brake cylinder (14) and whereby pressure can build up a deactivation pressure in the brake cylinder (14), so that the parking lock (24) is deactivated, and
• (ii) to control the brake valve (10) in such a way that it moves into a closed state so that pressure fluid can flow out of the brake cylinder (14) via the brake valve (10) directly into the depressurized tank (T) and no pressure fluid is fed into the brake cylinder (14) via the control valve (6) or the redundancy valve (7) and the brake valve (10), if the control valve (6) or the redundancy valve (7) remains in the open state due to a mechanical defect and otherwise should be in the closed state.