You are driving a motor vehicle with a manual gearbox. How do you conserve the service brake when driving down a long downward slope?

The combination of dropping down the gears and using the permanent brake is important for conserving the service brake while descending a long slope. Dropping down the gears allows the engine to slow the vehicle naturally, reducing reliance on the brake system and preventing overheating or wear. The permanent brake, or foot brake, can be used as needed to maintain control without excessive force, complementing the engine braking effect.

In contrast, using the parking brake is not appropriate for this situation. The parking brake is designed to hold the vehicle stationary when parked, not for controlling speed while moving. Using it while driving can lead to loss of control and is against safe driving regulations.

Following these practices adheres to principles in German traffic laws aimed at safety and vehicle maintenance. Proper braking techniques prevent accidents and ensure your vehicle remains in good working condition over time.