What type of air brake system is commonly used in heavy trucks?

The dual air brake system is widely used in heavy trucks because it enhances safety and reliability. This system consists of two separate air brake circuits, each with its own reservoir, compressor, and brake lines. The primary advantage of having a dual system is that if one circuit fails, the other can still function, providing a backup that assures the driver can maintain braking capability. This redundancy is particularly important in large commercial vehicles where stopping power is crucial for safety.

In contrast, single air brake systems, while simpler, lack this redundancy and can lead to total brake failure if a single component fails. Hydraulic brake systems, which are common in lighter vehicles, do not utilize compressed air and are therefore not suitable for the heavy loads and demands of large trucks. Pneumatic brake systems refer more broadly to the principles behind air brakes but do not specifically address the crucial feature of having dual circuits designed for enhanced safety.