What is done when changing a rear air-spring (air-bag)?

When changing a rear air-spring (air-bag), blocking the frame is a crucial step. This is done to ensure safety and stability while working on the suspension system. When the air-spring is removed, the vehicle's rear suspension can collapse, which could lead to injury or damage if the vehicle shifts unexpectedly. Blocking the frame provides a solid support base, preventing the vehicle from moving or tipping during the replacement process. This practice is standard in vehicle maintenance to safeguard technicians and ensure that components are accessed safely. Properly securing the vehicle is essential to complete the repair effectively and without risk.

Other actions, such as checking the rear axle alignment or adjusting the ride height valve, may be important at different times during maintenance or after installation, but they are not specifically tasks that must be performed at the initial stage of replacing the air-spring itself. Measuring the bag height before removal can also offer useful data for installation but is not as critical for safety as blocking the frame.