I have a 2003 EB Ford Expedition with 68,000 miles. Does anybody have an idea why the steering wheel wobbles ONLY during moderate to heavy breaking from speeds at or above 50 MPH? The front disc brake pads were replaced at 45,000 miles. The rear disc brake pads were replaced at 65,000 miles as was an alignment performed at 65,000 miles. When no brakes are applied, the vehicle drives smoothly and perfectly - no steering wheel wobble at all. If brakes are applied lightly at any speed, or, if the speed is slow (in town) driving, with any degree of brake pressure there is no wobble. All 4 disc brake rotors appear unscathed - there is no noise, just the steering wheel wobble when moderate to heavy braking pressure is applied when moving at or near highway speeds. Thanks for any pointers.