When it is necessary to check the braking system of your motorcycle immediately?

Your answer is correct because all these situations indicate a potential problem with the motorcycle's braking system that requires immediate attention.

1. A considerable drop in brake fluid level may signal a leak or worn brake pads, which can reduce braking effectiveness and safety.
2. Not feeling a pressure point when pulling the brake lever can mean that the brakes are not building proper hydraulic pressure, possibly due to air in the brake lines or fluid loss.
3. If the brake control light comes on while riding, it is a warning from the vehicle's system about brake malfunction.

In German traffic rules, braking systems must always be fully functional for safety. Therefore, noticing any of these signs means you must check and repair the braking system immediately to prevent accidents.