In which cases is it imperative to test the brakes?

Testing the brakes of a vehicle is crucial for safety and is mandated under certain conditions to ensure roadworthiness.

1. When driving a different vehicle: Each vehicle can have different brake systems, and it's essential to check the brakes to understand how they respond, ensuring safe operation.

2. If a vehicle has not been used for a longer period: Brakes can deteriorate when not in use, possibly leading to reduced effectiveness. Therefore, testing them ensures that they are functioning correctly before the vehicle is back on the road.

The option regarding engine oil changes is not directly related to the braking system. It is important to maintain the vehicle's overall health but does not specifically dictate brake testing.

By selecting both relevant conditions for brake testing, you're aligning with German traffic regulations emphasizing vehicle safety and responsible driving practices.