Most likely suspect is a warped brake rotor causing the caliper to shake back and forth. This is easiest to identify by removing the front wheels, then running the engine in gear, on a hoist. There can also be a chunk rusted and broken off a rotor.
Less common is a piece of debris caught between the hub and rotor or the rotor and wheel. You will see that as a wheel wobbling side-to-side when run on the hoist with the wheels still installed. That debris only becomes a problem after the wheel was removed, then reinstalled. If the vibration just started before the wheels were removed, this is not a good suspect.
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Friday, September 15th, 2017 AT 4:33 PM