If wheel bearing seals are functioning properly, water and other contaminants only have the power to damage the exterior of bearings. However, if water is able to seep past seals, it can corrode the integrity of bearings by changing the viscosity of lubrication. Changes in lubrication will cause excessive friction, which over time can lead to all sorts of mechanical deficiencies. Water can even set the stage for oxidation that will degrade bearing integrity subtly. Water is one of the most dangerous contaminants to protect against, because it can form the root cause of catastrophic bearing failure.