I’m not seeing how this could work on most driving surfaces. On asphalt you would have to penetrate the surface, which would require extreme force, or somehow apply additional downforce to a friction device, which would reduce braking friction to the other wheels.
No, you just have to push down hard enough to take some of the pressure off the tires. (In an extreme case you would lift the tires entirely off the ground. A nice side effect is that you would no longer need a tire jack. Hm, I am beginning to understand why car manufacturers don't implement this :-)
