What could be the possible cause of low air compressor output?

The selected combination of options effectively identifies two potential causes of low air compressor output. Excessive dirt in the intake air filter can restrict airflow, significantly impacting compressor efficiency, which is crucial for maintaining proper braking performance. A defective air compressor, on the other hand, directly affects how air is generated and delivered for the braking system, making it essential for safe vehicle operation.

In the context of German traffic laws, particularly those focusing on vehicle safety and maintenance, ensuring optimal functionality of the air compressor is vital. Any faults or restrictions can lead to suboptimal braking performance, potentially resulting in hazardous driving conditions. Knowing and addressing all possible causes, including maintaining clean filters and ensuring the compressor works efficiently, aligns with the obligation to keep vehicles roadworthy as per German regulations.