What applies to the effectiveness of the front and rear wheel brakes, especially at higher speeds?

The front brake is more effective than the rear brake, especially at higher speeds. This is because when you brake, weight shifts forward onto the front wheels, increasing their grip and braking power. The rear wheels, on the other hand, have less weight on them during braking and can skid more easily if braked too hard. Therefore, the front brake provides a stronger and more reliable stopping force. This is why in German traffic rules and driving practice, you are advised to primarily use the front brake for effective deceleration and rely less on the rear brake.