Role of Tubing in Air Brake Systems

Air brake systems are widely used in commercial vehicles such as trucks, trailers, buses, and articulated vehicles. Compressed air is transmitted through piping to braking control components and actuators.

Tubing connects the air compressor, air reservoirs, control valves, and braking components, forming a complete air transmission network. Different installation locations result in different tubing configurations.

Tubing Classification in Air Brake Systems

Tubing in air brake systems can be classified based on connection type into two categories: straight tubing (fixed routing) and coiled hose (dynamic connection), corresponding to Air Brake Tubing and Coiled Air Brake Hose.

Straight Tubing (Air Brake Tubing | Fixed Routing)

Straight tubing is primarily used in fixed air line installations within the vehicle chassis and body, such as main air distribution lines, connections between air reservoirs and brake valves, and internal pneumatic routing.

Key characteristics:

• Remains stationary after installation
• No repeated bending or extension during operation
• Maintains routing direction and structural stability

Tubing must provide consistent mechanical performance and stable pressure resistance for long-term system reliability.

Coiled Hose (Coiled Air Brake Hose | Dynamic Connection)

Coiled hoses are mainly used for connections between the tractor and trailer, typically visible as spiral-shaped tubing outside the vehicle.

Key characteristics:

• Connection length changes with vehicle movement and turning
• Requires repeated extension and bending

Tubing must provide good elasticity and recovery performance to maintain stable connections under repeated use.

Tubing Configuration in Air Brake Systems

In air brake systems, tubing configuration can generally be divided into three main parts: fixed piping within the vehicle chassis, dynamic connections between the tractor and trailer, and system connection fittings.

Different installation positions correspond to different tubing types, and must comply with the relevant regulations and standards of air brake systems in different countries.

→ Air Brake Tubing

→ Coiled Air Brake Hose

→ DOT Fittings

→ SAE J844 Type A / Type B and FMVSS 106 Requirements