Air pipes and lines deliver pressurized air throughout vehicle systems, primarily for braking, suspension, and exhaust recirculation. These components consist of reinforced rubber, nylon, or metal tubing, often incorporating quick-connect fittings and specialized bends for routing. Materials are selected for resistance to temperature extremes, oil, and abrasion. System-specific variations include high-pressure brake lines with steel reinforcement and durable, flexible air suspension lines. Proper installation and leak-free connections are critical for functional safety and component longevity.