Track Fork with brake - no no or go go?

the force need to push the fork toward the DT would be at a horizontal direction.

The force of the road vibration would be at a vertical direction, rather.

If you hit a brick wall, or a rather large pothole, or simply misjudge hopping the kerbs, then the fork would be more likely to hit the DT.

MS paint says the lever on the forks is twice as big when using a brake as when hitting something :)
foo'