When should you arrange for the braking system of your car to be checked?

In German traffic rules, you should have your car's braking system checked immediately if the brake warning light comes on while driving (option 1), because this indicates a possible serious brake system problem. Also, if your car does not stay in line during braking (option 2), it suggests uneven braking or brake defects that can compromise safety and require inspection. Performing an emergency braking maneuver (option 3) alone does not automatically mean the brakes need checking, unless it causes other warning signs. Therefore, the first two conditions are key warnings that your brakes may be faulty and need prompt checking to ensure road safety.