Freightliner Columbia 112/120 Air Spring-Level Val

Frequently Asked Questions About Freightliner Columbia 112/120 Air Spring-Level Valves

What does the air spring-level valve do on my Freightliner Columbia?

The level valve, also called a height control valve, regulates airflow to the air springs in the suspension system to maintain consistent ride height as load conditions change. It senses changes in axle-to-frame distance and adjusts air pressure in the air springs accordingly, helping keep the truck level whether it is loaded or empty.

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

Common signs include the truck sitting noticeably lower on one side, a sagging or bouncy ride, slow air leaks near the suspension, or the air springs failing to hold pressure. If you notice uneven ride height that does not correct itself after the air system builds pressure, the level valve or air spring linkage is a likely culprit.

Will these air springs and level valves fit both the Columbia 112 and 120 models?

Many parts in this category are designed to fit both the 112 and 120 chassis, but suspension configurations can vary by build year, axle type, and factory setup. Always check the listed specifications and part numbers against your truck's VIN or existing component before ordering to confirm a proper fit.

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

Basic replacement of an air spring or level valve is a common repair that many experienced technicians handle with standard tools, and some owner-operators with mechanical experience choose to do it themselves. That said, proper adjustment of the level valve linkage is critical to ride height and handling, so if you are unfamiliar with suspension air systems, having a qualified mechanic complete the installation and verify adjustment is recommended.

What material or build quality should I look for when choosing a replacement?

Look for air springs made with durable rubber bellows designed to handle repeated pressure cycling, and level valves with solid metal housings and linkage arms that resist corrosion and wear. Choosing components that match OEM specifications helps ensure consistent performance and a longer service life compared to generic aftermarket substitutes.