The spring-loaded brake has been applied on a truck which has broken down with engine failure. The air supply is exhausted. What effect does this have?

In this scenario, when a truck with a spring-loaded brake experiences engine failure and the air supply is exhausted, it is important to understand how the braking system operates under these conditions.

1. The spring-loaded brake not responding to the handbrake valve means that without sufficient air pressure, the normal operation of the brakes is compromised. The spring brake system relies on air to function, and without it, activation by the handbrake is ineffective.

2. To tow the vehicle away, it is essential to release the spring-loaded brake using the emergency release device. This is crucial because if the brake remains engaged, the vehicle cannot be safely moved. The emergency release allows the vehicle to be towed without the brakes holding it in place.

Understanding these points aligns with German traffic regulations, which emphasize safety and operational efficiency in braking systems, especially in cases of breakdowns. It is vital to recognize scenarios where the brakes must be properly managed to prevent hazards on the road.