Originally Posted by Barrettscv

The big difference between the fork mounted hangers and hangers installed near the upper headset bearing, is that the fork mounted hanger flexes in concert with fork, eliminating shudder. Shudder happens with a headset mounted hanger when the brake is applied and the bending of the fork blades literally pulls on the cable, increasing the braking action. This sets up a oscillation, making the bike difficult to control smoothly.

Since the hangers pictured above are installed right on the crown of the fork, the dynamic pull on the cable is nearly eliminated.

Yes, with a strong grip, you might see some compression of the fork mounted hanger, but that won't set up an oscillation.

Michael