Join Date: Apr 2005
Location: SW Washington State
Several things to check out, worn brake pads, scored rotors, front wheel bearings, loose brake caliper bolts, loose head bearings, cupped tire condition and or low tire pressure all could exhibit similar symptoms or though you state your familar with it a disk with too much runout would be the most likely cause.
A runout gauge is simple enough test, or even a magic marker wired to just touch the rotor and spinning the wheel could show greater and lesser pressure by the line left behind as an indication that further investigation and measurment is required.
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