Peterbilt 367 Air Springs & Level Valves

Frequently Asked Questions About Peterbilt 367 Air Springs & Level Valves

What do air springs and level valves actually do on my Peterbilt 367?

Air springs (also called air bags) support the weight of the cab or suspension and provide cushioning over bumps, while level valves automatically adjust air pressure to keep the ride height consistent as load and terrain change. Together they help maintain a stable, comfortable ride and protect the frame and drivetrain from excess shock.

How do I know if my air spring or level valve is failing?

Common signs include a sagging cab or axle on one side, a noticeably rougher ride, hissing or air leak sounds near the suspension, uneven tire wear, or the truck sitting lower than usual after being parked overnight. If the level valve linkage is bent, disconnected, or corroded, it may also cause the ride height to stay too high or too low regardless of load.

Will these parts fit my specific Peterbilt 367 configuration?

Air spring and level valve fitment can vary based on cab suspension type, axle configuration, and the original equipment used on your specific truck. Always check the listed part number, dimensions, and OEM cross-reference information against your truck's existing components before ordering to confirm proper fit.

Can I install a new air spring or level valve myself, or should I have a professional do it?

Many experienced technicians and fleet mechanics replace air springs and level valves themselves, since the job typically involves supporting the cab or axle, disconnecting air lines, and swapping the component with basic hand tools. However, because these parts affect ride height, stability, and air system pressure, it's important to follow proper safety procedures, release system air pressure before disconnecting lines, and double check linkage adjustment on level valves after installation. If you're not comfortable working around a supported cab or pressurized air system, having a qualified technician handle the job is a safer choice.

How long should a replacement air spring or level valve last?

Service life depends on the quality of the part, driving conditions, and how well the linkage and air lines are maintained. Rubber air springs can degrade over time from exposure to road debris, ozone, and temperature extremes, while level valve linkages can wear or corrode. Regularly inspecting these components for cracking, leaks, or looseness can help you catch problems early and avoid unexpected downtime.