Jack up the front end and spin the tires, listen for any unusual sounds. grab the tire at the 3 and 9 o'clock positions, move the tire in and out with out turning the tire to check the bearing play. (you can also check the ball joints this way too). You can also do this for the back tires as well. Also with the back wheel bearings, only the inner bearings are lubed with the oil/grease fittings. The outer bearings have to be done by hand. If everything seems ok try a test drive as follows.
Try taking the car on a 5 mile drive with light braking applications and check the hub tempature. if one is hotter than the others change both bearings and both sides pass and driver.
Joe Lee