What happens if the service brake is activated while the permanent brake is switched on?

When the service brake is activated while the permanent brake is engaged, a stronger braking force is applied to the wheels of the drive axle(s). This interaction enhances the overall braking power, which is crucial for effective vehicle control, especially in emergency situations or on steep descents.

Additionally, it's important to note that when both the service brake and permanent brake are active, it does not lead to automatic disengagement of the permanent brake. Instead, both systems work together, providing double the braking force, which is particularly important for heavy vehicles or in conditions where significant stopping power is needed.

This knowledge is important according to German traffic regulations, as proper understanding and usage of braking systems ensure safety on the road, preventing accidents due to inadequate braking performance.