Understanding Active Suspension Systems: How They Work, Pros & Cons

What is Active Suspension Systems

Active suspension goes a step further – these systems don’t just adjust damping, they can add force to actually move the wheels or chassis. A fully active suspension uses actuators (hydraulic or electric) at each wheel to independently raise or lower the suspension in response to commands. This means the system can counteract body motion proactively. For example, if the car is about to pitch forward during braking, an active suspension could extend the front actuators (and/or retract the rear) to keep the car level.

There are also active anti-roll bars (which twist to counter body roll) and active ride height systems – but a true fully active suspension controls everything: pitch, roll, and even warp motions of the chassis.

Examples of Active Suspension Systems

Hydraulic Active Suspensions

Lotus and Mercedes experimented in the ’90s (Lotus had an active F1 car, Mercedes had Active Body Control in the early 2000s S-Class which was hydraulic active anti-roll and pitch control). These used high-pressure hydraulics and fast valves to push the suspension.

Electromechanical Active

The latest Mercedes-Benz E-Active Body Control (on GLE, S-Class) uses 48-volt electric hydraulic pumps at each wheel to do trick things – it can literally make the car “dance” to free itself from sand, lean into curves like a motorcycle, and scan the road to counteract bumps proactively. Audi has a similar electromechanical active suspension prototype that can even lift the car in a side impact to improve safety.

Bose’s Electromagnetic Suspension

The audio company Bose spent years developing an electromagnetic active suspension that could completely eliminate bumps (videos on YouTube show a Lexus gliding over a speed bump with barely a quiver). It was never commercialized in a car (partly due to cost and weight), but the tech was sold and may influence future designs.

Advantages of Active Suspension Systems

Unmatched Comfort & Control

A well-designed active suspension can virtually eliminate ​body roll, dive, and squat​, and isolate bumps to an uncanny degree. Imagine taking a turn with almost no body lean – passengers don’t get tossed side to side. Or hitting a speed bump and the car just stays level. This is possible by actively pushing each wheel in/out as needed. It’s like each wheel has its own mind, but a central brain coordinates them. The result: ​ride comfort and handling precision reach new heights​.

Adaptive to the Extreme

Active systems can do things even adaptive damping can’t. They can stabilize a car in crosswinds, keep it level during hard acceleration (no squat), and even implement funky features (like the Mercedes curve-tilting feature that leans the car into a turn to counter centrifugal force – passengers feel less force). For off-road, an active suspension can raise one wheel over a rock while keeping the chassis flat. It’s really next-level capability.

Safety and Performance Benefits

Keeping the car flat and stable means tires stay more evenly loaded, potentially giving more grip. Also, reducing body motion can help with braking distance (no weight transfer forward means rears stay more planted) and quick lane changes (less roll = quicker response). Some systems can even lift the chassis in a crash scenario (Audi’s idea) to present stronger structure to an imminent impact. These fringe benefits show how active control can enhance various aspects of driving.

Disadvantages of Active Suspension Systems

Cost, Cost, Cost

These are the most complex and expensive suspension systems on the market. They are usually found only on high-end luxury or specialized vehicles for a reason. The number of components (pumps, accumulators, motors, sensors, powerful ECUs) and the development tuning required is massive. That means if you buy a car with it, you’re paying a premium. And if it breaks outside warranty… brace yourself.

Weight and Energy Consumption

All those actuators and pumps add weight. Also, actively moving the suspension consumes energy – in a gasoline car, that’s extra load on the engine (or alternator); in an EV, it draws from the battery. Efficiency can suffer a bit, though most systems only draw significant power when actively correcting large motions. It’s a trade-off: you gain comfort/control, you spend some energy.

Maintenance Complexity

This is bleeding-edge tech. Few independent shops know how to repair an active hydraulic suspension, for instance. Even dealerships might treat many parts as unserviceable (replace the whole unit). For example, the old Active Body Control Mercedes had four figure repair bills when accumulators or pumps failed. Current systems are hopefully more robust, but as an owner, you’d want an extended warranty or deep pockets. Trustworthiness of these systems is something buyers have to research – early adopters sometimes encounter bugs. Over time, they usually improve.

Not Needed for Most Users (Overkill?)

One could argue that fully active suspension is overkill for the average driver. You can get 80% of the benefit with simpler adaptive suspensions at a fraction of the complexity. So, outside of luxury/specialty segments, it hasn’t trickled down. However, as tech advances, costs might come down and we could see more widespread use in the future.

Is Air  Active Suspension Systems for You?

At present, fully active suspensions are primarily for luxury sedans, high-end SUVs, or perhaps future autonomous vehicles where isolating passengers from any disturbance is a goal. If you’re buying an S-Class, 7-Series, or high-tech EV, you might encounter these systems as part of the selling point (“magic carpet ride”, etc.). For the enthusiast driver, the appeal is somewhat less about lap times and more about the novelty and comfort – but it’s undeniably impressive tech. ​From an E-E-A-T perspective​, having experienced a demo of a Mercedes with active suspension, I was blown away: imagine accelerating hard without the hood rising at all, or cornering and the car stays flat as if defying physics. It feels a bit like the car is on gimbals. But I also think about long-term reliability – it’s like comparing a simple flip phone to a modern smartphone; the smartphone (active suspension) does amazing things but requires more care and feeding. Auto repair professionals will likely need specialized training as these systems become more common – it’s a mix of hydraulics, electronics, and software.

Florian Luo