Automotive Service Excellence (ASE) Brakes Certification Practice Exam

How is lubrication of serviceable tapered wheel bearing assemblies accomplished?

1. Wheel bearing grease or gear lube depending on manufacturer recommendation

2. Neither wheel bearing grease nor gear lube

3. Gear lube

4. Wheel bearing grease

The correct answer is: Wheel bearing grease or gear lube depending on manufacturer recommendation

Lubrication of serviceable tapered wheel bearing assemblies is accomplished by using either wheel bearing grease or gear lube as specified by the manufacturer's recommendation. Different manufacturers may design their wheel bearings to work optimally with certain types of lubricants based on factors like operating conditions, load capacity, and expected lifespan. Wheel bearing grease is specifically formulated to provide excellent adhesion, water resistance, and protection against high stress and heat, making it suitable for most applications. Gear lube, on the other hand, can be used in certain situations, particularly if the wheel bearing is part of a hub assembly that integrates with the differential or is exposed to heavy loads or high operating speeds. Using the right lubricant ensures that the bearings remain adequately protected from wear and tear, provides efficient performance, and extends their service life. Following the manufacturer's specifications is crucial, as using the incorrect lubricant could lead to premature failure of the bearing assembly. This consideration positions the correct choice as the most comprehensive and accurate answer regarding the lubrication of tapered wheel bearing assemblies.