SOS Mechanic Certification – Brakes Practice Exam 2025 - Free Mechanic Brakes Certification Practice Questions and Study Guide

Most vehicles manufactured from 1995 onward typically use sealed non-serviceable wheel bearings on non-drive wheels. These sealed bearings are designed to be maintenance-free, which means they are pre-greased and encased in a protective housing. This design eliminates the need for regular servicing or adjustments, as the bearings are not meant to be disassembled or serviced during their expected lifespan.

Sealed non-serviceable bearings offer several advantages, including improved durability and resistance to contamination, as the sealed design prevents dirt and moisture from entering the bearing assembly. This contributes to longer service intervals and reduced labor costs related to maintenance.

In contrast, the other types of bearings listed have characteristics that are not commonly found in modern vehicles. Loose ball bearings require regular adjustment and maintenance, which is not practical for most contemporary designs. Adjustable tapered bearings, while still used in some applications, are often found in older vehicles or specific performance models where flexibility in adjustment is necessary. Conventional greaseable bearings require periodic lubrication and maintenance, which is contrary to the trend towards low-maintenance designs in newer vehicles.