Merv's Quote; "It's a safe bet that it isn't the brake components because there is a good chance that they brakes would pulsate."

Good point. Also, A severe 'tow out' front end alignment could cause this too.

My Quote:"I would check those wheels real close. Look at the surface that goes against the hub. See if there is anything that would make it mount slightly crooked."
The indicator or '2x4 with nail' test would highlight this problem.