Freightliner FLC120 Air Springs & Level Valves

Frequently Asked Questions About Freightliner FLC120 Air Springs & Level Valves

What do air springs and level valves actually do on my FLC120?

Air springs (air bags) are the rubber and metal components that support the cab or suspension and absorb road shock by inflating and deflating with compressed air. Level valves work alongside the air springs to automatically adjust air pressure, keeping the cab or axle riding at the correct height as load and road conditions change. Together they help maintain a smoother, more stable ride and reduce wear on other suspension components.

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

Common signs include a sagging or uneven cab or chassis height, a rougher than normal ride, visible cracking, bulging, or dry rot on the air spring itself, or audible air leaks near the suspension or cab mounts. If the cab rocks excessively over bumps or does not return to normal ride height after hitting a pothole, the level valve linkage or valve itself may be worn or misadjusted.

Will these parts fit my specific FLC120 model year and configuration?

Freightliner made changes to cab and axle suspension setups across different FLC120 production years, so it is important to check the listed specifications, including mounting style, height, and connection type, against your truck's OEM part number before ordering. If you are unsure, having your VIN and current part number on hand will make it much easier to confirm the correct match.

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

Many experienced truck owners and fleet mechanics replace air springs and level valves themselves with basic hand tools, a jack, and proper safety stands. That said, the job involves working under a supported cab or chassis and handling components under air pressure, so if you are not comfortable with that kind of work, having a qualified technician handle the installation is a safer choice.

Are aftermarket air springs and level valves as reliable as OEM Freightliner parts?

Quality aftermarket air springs and level valves are built to match OEM fit, form, and function, and many truckers use them successfully as a cost effective alternative. As with any replacement part, reliability comes down to the manufacturer, so it helps to choose a reputable brand and confirm the part is rated for your truck's weight and suspension configuration.