This comprehensive service bulletin provides detailed guidance on troubleshooting misalignment issues with AirLiner™ Suspension air-spring bags. It is specifically designed for Freightliner trucks, encompassing a wide range of models including COE (Cab Over Engine) variants like FLA, FLB, Argosy, and Business Class M2, as well as conventional models such as FLD, FLC 112, Century Class, Cargo, Columbia, Coronado, and Cascadia. The bulletin covers troubleshooting steps for AirLiner™ suspension systems across these truck models, empowering technicians to effectively diagnose and resolve air-spring bag misalignment problems.

## AirLiner Suspension Air Spring Bag Misalignment Troubleshooting for Freightliner Trucks Freightliner, a leading manufacturer of heavy-duty trucks, utilizes AirLiner suspension air spring bags in various models, including the FLA, FLB, FLD conventional, Business Class, FLC 112 conventional, Century Class conventional, Argosy COE, Cargo, Columbia, Coronado, Business Class M2, Cascadia, and more. These air spring bags are crucial components of the vehicle's suspension system, responsible for providing a smooth and comfortable ride, absorbing shocks and vibrations, and maintaining proper vehicle height. However, misalignment of these air spring bags can lead to various issues, such as uneven tire wear, reduced fuel efficiency, instability, and potential damage to other suspension components. AirLiner air spring bag misalignment can occur due to several factors, including improper installation, wear and tear on the suspension system, uneven road surfaces, and overloading. Troubleshooting misalignment involves a thorough inspection of the air spring bags and their surrounding components. This includes checking for any signs of damage, wear, or misplacement. The technician will also need to verify that the air spring bags are properly inflated and that the air pressure is consistent across all bags. If misalignment is detected, it must be corrected immediately to avoid further damage and ensure optimal vehicle performance. This may involve adjusting the air spring bag mounting points, replacing worn-out components, or re-aligning the suspension system. By addressing misalignment promptly, Freightliner truck owners can maintain a smooth ride, enhance fuel economy, maximize vehicle lifespan, and ensure driver comfort and safety.