Kenworth T660 Air Springs & Level Valves

Frequently Asked Questions About Kenworth T660 Air Springs & Level Valves

What do air springs and level valves actually do on my Kenworth T660?

Air springs (also called air bags) support the weight of the cab or chassis and absorb road vibration as part of the air suspension system. Level valves regulate airflow into the air springs to keep the ride height consistent as load conditions change. Together, these components work to maintain a stable, controlled ride and reduce stress on the frame and cab mounts.

How do I know if my air spring or level valve needs to be replaced?

Common signs include a sagging cab or chassis, uneven ride height side to side, a rougher or bouncier ride than normal, visible cracks or bulges in the air spring bellows, or audible air leaks near the suspension components. If the cab sits noticeably lower after sitting overnight, the level valve or air spring is often the cause.

Will these parts fit my specific T660 configuration?

Air springs and level valves can vary based on cab suspension type, axle configuration, and model year, so it's important to check the listed specifications and part numbers against your truck's original equipment before ordering. If you're unsure, having your VIN or the part number from your existing component on hand will help confirm the correct match.

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

Many owner-operators and shop technicians replace these parts with basic hand tools, but the job typically requires releasing air pressure from the system, supporting the cab or chassis safely, and correctly adjusting the level valve linkage after installation. If you're not familiar with air suspension systems, having a qualified technician handle the installation and final adjustment helps ensure proper ride height and performance.

What's the difference between OEM and aftermarket options for these parts?

OEM-style parts are built to match the original specifications of your T660's suspension system, while aftermarket options can offer a range of price points and warranty terms. Both can be reliable choices, but it's worth comparing materials, warranty coverage, and fitment details to find the right balance of cost and durability for your application.