Porsche Active Suspension Management (PASM) is an electronic control system which uses continuous damper adjustment to maintain optimum ride quality and comfort. The push-button system is standard on the 911 Carrera 4S and optional on the 911 Carrera 4.

PASM has two setup modes, "Normal" and "Sport", with only minimal overlap between the two. While the former is a mix of performance and comfort, the "Sport" setup mode has a much firmer range of settings for greater performance capabilities. The system responds to changing road conditions and/or driving styles by applying a variable damping force within the defined range for the selected mode ("Normal" or "Sport").

To do that, PASM uses a series of sensors that monitor all movements of the car's body. The PASM control unit then evaluates this data and modifies the damping force on each of the wheels. The results are a reduction in pitch and roll as well as consistent road-holding on all four wheels.

If "Sport" mode is selected, the suspension is set to a harder damper rate. If the quality of the road surface drops below a certain threshold, the system immediately changes to a softer rating within the "Sport" setup band and thus restores the car's grip and traction. When the road surface improves, PASM returns to the original, harder setting.

If "Normal" mode is selected, and the car is driven assertively, PASM automatically switches to a harder rating within the "Normal" setup band. As the dampers become stiffer, the car becomes more stable and responds more quickly to driver inputs.

In either case, the result is a car which can adapt the way it handles and rides to the driver's driving style.