Peterbilt 567/579 Air Springs & Level Valves

Frequently Asked Questions About Peterbilt 567/579 Air Springs & Level Valves

What do air springs and level valves actually do on my Peterbilt 567/579?

Air springs support the weight of the cab or chassis and absorb road shock as part of the air suspension system, while the level valve (also called a height control valve) automatically adjusts air pressure in the springs to keep the ride height consistent as load conditions change. Together they help maintain a stable, comfortable ride and proper cab or axle alignment.

How do I know if I need a new air spring or just a new level valve?

If your cab or suspension sits noticeably lower on one side, sags over time, or bounces excessively, the air spring itself may be worn, cracked, or leaking. If the ride height is inconsistent, slow to adjust, or the cab does not level out after loading, the level valve linkage or valve itself may be worn or out of adjustment. Inspecting both components for visible damage, air leaks, and proper linkage movement can help narrow down the issue before replacement.

Will these air springs and level valves fit my specific Peterbilt 567 or 579 configuration?

Air springs and level valves vary by cab suspension type, mounting location, and model year, so it is important to confirm the specific part number matches your truck's configuration before ordering. Checking your existing component's part number or measurements against the listing details is the most reliable way to ensure proper fit.

Can I install a replacement air spring or level valve myself?

Many owners and independent shops replace these components with common hand tools, but the job typically involves supporting the cab or chassis safely, disconnecting air lines, and correctly setting the level valve linkage arm to the proper angle after installation. If you are not familiar with air suspension systems or lack the equipment to safely support the cab, having a qualified technician handle the installation is a good idea.

What causes air springs or level valves to fail prematurely?

Common causes include age-related rubber deterioration, exposure to road debris and contaminants, overloading, and linkage arms that have loosened or been knocked out of adjustment. Regularly inspecting the air springs for cracking or leaks and checking that the level valve linkage remains properly connected and adjusted can help extend the life of both components.