Kenworth T680 Air Springs & Level Valves

Frequently Asked Questions About Kenworth T680 Air Springs & Level Valves

What do air springs and level valves do on my Kenworth T680?

Air springs (also called air bags) support the cab or suspension and absorb road shock by using compressed air instead of steel springs, providing a smoother ride. The level valve, or height control valve, automatically adjusts air pressure in the springs to maintain proper ride height as load conditions change. Together, these components keep your cab or axle riding level and help reduce vibration transferred to the driver and chassis.

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

Common signs include a cab or chassis that sags on one side, a rougher than normal ride, visible cracking or bulging in the rubber air spring bellows, audible air leaks near the suspension components, or the truck failing to maintain consistent ride height even after the compressor cycles. If you notice any of these symptoms, it is a good idea to inspect the air spring and associated linkage on the level valve for wear or damage.

Will these air springs and level valves fit my specific Kenworth T680 model year?

Kenworth T680 trucks have been produced across multiple model years with some variation in cab suspension and chassis setups. Always check the listed specifications, part numbers, and compatibility notes on each product page against your truck's existing components or VIN-specific build sheet before ordering. If you are unsure, comparing your old part's number or measurements to the replacement is the most reliable way to confirm a proper fit.

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

Many experienced diesel technicians and owner-operators do replace air springs and level valves themselves, since the job typically involves supporting the cab or axle, releasing air pressure, disconnecting the linkage, and swapping the component. However, working around a raised cab or pressurized air system carries real safety risks if not done carefully. If you are not comfortable with cab safety props, air system depressurization, or torque specs, having a qualified shop handle the install is the safer choice.

What is the difference between OEM and aftermarket air springs and level valves?

OEM parts are built to the original Kenworth specifications and are designed to match the exact fit and performance of the component your truck came with. Aftermarket options are manufactured by third-party suppliers and can offer a more budget-friendly alternative, though quality and durability can vary between brands. When choosing between the two, consider your budget, how the truck is used, and whether the aftermarket brand has a track record of reliability with other T680 owners.