Final answer:
During the pre-trip inspection, it is essential to check the wheel bearing seals to ensure they are not leaking and are free from wear or damage, thereby maintaining the integrity of the wheel bearings for safe vehicle operation.
Step-by-step explanation:
During the pre-trip inspection, you should check the wheel bearing seals to determine that they are not leaking and have no signs of wear or damage. Wheel bearing seals are crucial for maintaining the lubrication within the bearings and keeping out dirt, moisture, and other contaminants that could lead to bearing failure. Inspecting the seals for integrity ensures that the wheel bearings remain in good condition, which is essential for the safe operation of the vehicle. It is important to check for any signs of oil or grease build-up around the wheel area, as this may indicate a leaky seal. If a seal is compromised, it should be addressed promptly to prevent further issues.