Air ride suspension replaces traditional steel springs with heavy-duty rubber bags filled with compressed air. An onboard compressor and air tanks supply the pressure. Height control valves monitor the distance between the axle and the frame, automatically adding or releasing air to keep the truck level under different loads. This keeps the ride smooth, whether the trailer is empty or carrying 45,000 pounds of freight.
Drivers and shippers prefer air suspension because it protects delicate cargo from road vibrations. It also reduces wear on the truck's frame, tires, and cab components. If an air bag leaks or pops on the highway, the suspension drops onto the rubber bumpers, causing a rough ride and potential frame damage. Drivers should listen for air leaks during their pre-trip inspection and check the air pressure gauges on the dashboard.