An out of true wheel or loose headset won't cause brake vibration.
Clean the brake tracks. I just wipe then off with a shop towel. Don't use anything that will leave a residue (simple green, carburetor cleaner, wd-40: none of those). On a couple wheels that got bad brake vibration I've lightly sanded the brake tracks with a 3M scotchbrite pad.
But the likely problem is that your brake pads are old or not toed-in properly.
Make sure your rim isn't dented anywhere. Hitting a curb or pothole might do this.
Make sure your brakes are tightly attach to the fork, the pads are tight, and the pads aren't hitting any part of the tire.
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