| engine does not
| have to be running, nor does the car need to be in gear for the sound
| to happen... I can create the sound just by coasting and applying the
| brakes (with the engine off.)

Wheel bearing needs more lubricant, like my '90 accord's
rear left wheel's. Grease is not as slippery as synthetic oil /
fullerene, use the most slippery lubricant available.