What is the primary source of power for air brake systems?

Answer: B — Compressed air from the air compressor

The primary source of power for air brake systems is compressed air from the air compressor. In vehicles equipped with air brakes, the air compressor plays a crucial role by generating and maintaining pressure within the air brake system. This compressed air is stored in reservoirs and used to actuate the braking components, allowing for reliable and effective braking performance. Using compressed air has several advantages, including reduced risk of brake fade caused by overheating, which can occur in hydraulic systems during prolonged use. Air brakes also provide quicker response times and the ability to modulate brake pressure more easily, resulting in smoother stops. The reliance on compressed air highlights the importance of regular checks and maintenance of both the air compressor and the reservoirs to ensure optimal functionality of the air brake system.