The rear wheels of an unloaded vehicle equipped with an automatic load-dependent braking force regulator (ALB) lock each time the brakes are strongly applied. What can be the cause?

The combination of options you selected relates to potential issues with the braking system of the vehicle.

1. If the ALB (automatic load-dependent braking force regulator) is defective or incorrectly adjusted, it can lead to an improper distribution of braking force, causing the rear wheels to lock under heavy braking.

2. If several spring leaves on the rear axle have broken, this can affect the suspension and the overall stability of the vehicle during braking, potentially leading to rear wheel lock-up.

Both these factors are important because they ensure that the vehicle's braking system functions correctly under various load conditions. If either the ALB is malfunctioning or the suspension is compromised, it can create dangerous driving conditions, which is why understanding and maintaining this system is critical for safety on the road.

Strong fading of the brakes was not selected as a cause, but it is also important to consider, as it refers to the loss of stopping power due to heat build-up, which can be a separate issue.

In German traffic regulations, proper functioning brakes are paramount for vehicle safety, and drivers must ensure all systems are checked and maintained regularly to uphold these standards.