Brakes: smooth low speed, shuddering at higher speeds

[haasman]

Any suggestions on this one?

The 300E brakes normally and smoothly a low speeds but from higher (such as highway) speeds the front end shudders.

Someone recently posted a very similiar problem with a picture but after many searches I could not find the thread.

I pulled a front wheel. The rotor has what looks like spots on it that are brown. What causes this?

Do I have an ABS sensor problem?

Haasman