Brake fade is a phenomenon which decreases the braking efficiency. Runway pavement surface is prepared and maintained to maximize friction for wheel braking. Tracks can get rough from the braking and steering action. There have also been improvements in braking and steering. Tire marks extended indicating emergency braking action. The flywheel also stored energy through regenerative braking. Two sets are applied against the treads of the steel wheels for friction braking. This helps reduce weight and simplifies the aircraft's braking and hydraulic systems. Paddle shifters are used to adjust the amount of regenerative braking. The NC700SA model is also available with the addition of a combined antilock braking system. Likewise, when braking the front noses down and the rear rises. This relieves the forks of any braking and suspension forces. Consider the example of a braking and decelerating car. This means the differential will provide some level of limiting under engine braking. Their design uses electrodynamic suspension for levitating and eddy current braking.