2012 Formula One World Championship
In January 2012, the FIA banned the use of "reactive ride-height". The system, first proposed by Lotus in 2010 (but not applied until 2012), used hydraulic cylinders in the brake calipers and suspension push-rods to make minute adjustments to the ride height of the car, thereby keeping the ride height at an optimal level throughout the race and providing stability during braking. The FIA initially approved the device as being legal, and several teams, including Ferrari and Williams, gave plans to the FIA for their own versions of the device before it was banned one week later. No reason was given for the reversal of the decision, though it was reported that the reactive ride-height systems violated Article 3.15 of the technical regulations, which states that "any aerodynamic effect created by the suspension should be incidental to its primary function" and "any device that influences the car's aerodynamics must remain immobile in relation to the spring part of the car".