Mack RD Truck Air Springs & Level Valves

Frequently Asked Questions About Mack RD Truck Air Springs & Level Valves

What do air springs and level valves actually do on my Mack RD truck?

Air springs (also called air bags) are part of the suspension system and support the weight of the truck and trailer while absorbing road shock. Level valves work alongside the air springs to automatically adjust air pressure, keeping the truck riding at the correct height regardless of load. Together, these components help maintain a stable, controlled ride and protect the frame and other suspension parts from excess stress.

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

Common signs include a sagging or uneven ride height, visible cracking or bulging in the air spring rubber, audible air leaks near the suspension, or a truck that leans to one side when parked. If you notice the ride height changing after sitting overnight or the compressor cycling more often than usual, the level valve or an air spring is often the cause.

Will these air springs and level valves fit my specific Mack RD model and axle position?

Mack RD trucks were built over many years with different suspension setups, so air springs and level valves are not always interchangeable across model years or axle positions (front, rear, drive). Always check the part number against your truck's suspension type and axle location before ordering, and compare bolt patterns and mounting height to your existing part if you're unsure.

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

Many owner-operators and shop technicians replace air springs and level valves themselves, since the job typically involves supporting the axle, releasing air pressure, and swapping the component with basic hand tools. That said, working around a loaded suspension system requires care, and if you're not comfortable safely supporting the vehicle or bleeding the air system, it's worth having a qualified technician handle the installation.

What's the difference in quality between OEM and aftermarket air springs and level valves?

OEM parts are built to match Mack's original specifications exactly, while quality aftermarket options are manufactured to fit and perform similarly, often at a lower cost. The right choice depends on your budget and how particular you are about matching original equipment. Whichever you choose, look for solid rubber construction on air springs and smooth, consistent operation on level valves, since these directly affect ride quality and component lifespan.