How does it work?

LiquidSpring is a Smart Suspension

LiquidSpring automatically and instantaneously changes the spring stiffness and damping at each individual wheel in response to road and driving conditions. When the road’s rough, the ride is soft and smooth. When the vehicle makes sharp turns, corners, or emergency evasive maneuvers, the suspension stiffens to provide superior stability and eliminates roll. Thanks to the on­board processor, the suspension adapts and makes adjustments without driver intervention for a fluid, seamless experience.


LiquidSpring is built with CLASS®

The LiquidSpring Compressible Liquid Adaptive Suspension System or CLASS® is a smart suspension system for ambulances, shuttle buses, RVs and military vehicles. Liquid-based struts and an onboard processor provide better handling and control when you need it, and a smoother, softer ride when you want it. The reduced vehicle vibration increases comfort and can also lower maintenance costs.

In short, we named our company LiquidSpring because it is the heart of our system, a shock-absorbing liquid, enhanced with smart controls to bring you the right sized spring for every moment, instead of a one-size-fits-all metal spring solution.

Limo-like ride

Features and Benefits

  • Seamlessly, without driver intervention, automatically, and instantaneously provides a very soft spring or a very stiff spring with associated damping as needed for road and driving conditions.
  • Automatically load levels chassis compensating for imbalance and variations in vehicle payload distribution.
  • Kneeling and over-height capability.
  • Pump only operational while load and chassis leveling thereby consuming minimal power.
  • User-friendly driver interface with graphic display for drive and diagnostic modes to integrate system control and chassis leveling while providing means for troubleshooting system.

How does LiquidSpring work?

LiquidSpring uses an optimized 5-­link suspension configuration, struts with a compressible fluid as the spring/damping medium, and a sophisticated on‐board microprocessor to monitor driving conditions. This microprocessor acts as the suspension systems’ brain and allows for automatic and instantaneous change of spring stiffness and damping at each individual wheel. This provides the ability to reduce ride harshness while increasing roll and pitch control.




Low and High Stiffness Functionality

Computerized control

LiquidSpring monitors and processes various vehicle signals and motion at each wheel via its ECU and instructs each corner strut to change its stiffness and damping characteristics as required to minimize power transmitted from the suspension to the chassis while maintaining body control. The strut stiffness and damping characteristics are dependent upon its effective fluid volume.

LiquidSpring incorporates a rate valve between the strut and the secondary volume. The rate valve controls the interaction of fluid between the strut and secondary volume, thereby managing the effective fluid volume. As shown above, when the valve is completely open, the strut exhibits its lowest stiffness. When the valve is completely closed, the strut exhibits its highest stiffness. The valve is proportionally closed to cause the strut to exhibit transitional stiffness and damping.




LiquidSpring System Components

(click to enlarge)


The suspension is a 5-Link non-torque reactive design that maintains proper driveline angles throughout the range of travel which minimizes driveline noise, vibration, and fatigue. The jounce travel of the suspension provides for compliance with Federal Specification KKK-A-1822 for rear floor height requirements when the “kneel” feature is used. Installation does not require modification to the O.E.M. exhaust system and its capacity rating matches the O.E.M. rating.



Strut Module

The strut is fairly similar to a conventional hydraulic cylinder except the rod and non-rod chambers are equally pressurized and separated by viscous damping elements. The internal strut fluid pressure is proportional to the external load applied to it.

The extension or retraction of the strut is detemined by adding or subtracting fluid volume (at pressure proportional to the external load) equal to the amount of rod volume to be displaced. An integral rebound stop is built into the strut and it is pre-filled for installation.

2nd Fluid Volume

2nd Fluid Volume

The second fluid volume is a pressure vessel mounted to the chassis frame. It is connected to the strut via conventional hydraulic hose and fittings. This unit provides the spring rate change. Its rate valve is critical in the performance of LiquidSpring’s suspension.

The 2nd volume is pre-filled for installation.

CLASS Power Module with ECU

Power Module with ECU

The power module integrates the pump, motor, manifolds, control valves, filters, low-pressure reservoir, and ECU and is mounted to the chassis frame. Industry standard hydraulic and electrical connections are used to interface it with the system.

Driver Interface

Driver Interface

The driver interface provides a means to adjust ride modes, change suspension heights, and notify the driver of system issues via a red warning LED. Troubleshooting system problems can be facilitated with the diagnostic codes illuminating various LED’s. The system can also be enabled/disabled via the On/Off button on the driver interface.

LiquidSpring facility

LiquidSpring custom manufactures suspensions and components using multiple processes. From advanced laser cutting to CNC machining and presses, all are finished off with a durable powder coat application. Assembled with custom-length hydraulic lines, the system is ready for installation at our main plant or our network of partners.

See the LiquidSpring manufacturing facility in Lafayette, Indiana

Developed for Mining

Our first application was large off-highway mining equipment where we pioneered our suspension system to reduce operator injury from extreme conditions.

Today, we bring an advanced, highly adaptive smart suspension to on-road, light- and medium-duty truck chassis providing an exceptionally smooth and luxurious ride across multiple markets.

Industries we serve

How can we help you?