Answer :
Final answer:
The oily fluid leaking on the inside of the tire could come from several sources, including a leaking wheel seal, wheel cylinder, hub cap gasket, or axle shaft gasket. Among these, a leaking wheel seal is a common cause of such leaks and should be investigated first. Proper inspection of brake components is essential for safety.
Explanation:
Brake Inspection and Potential Issues
During inspection of the brakes on a semi-tractor, finding an oily fluid leaking on the inside of the tire can indicate several potential issues related to the braking or axle components. Let's review the options:
- OA. A leaking wheel cylinder: This part is part of a hydraulic brake system and can leak brake fluid, causing fluid to accumulate.
- OB. A leaking axle shaft gasket: If the axle shaft gasket is faulty, it may allow lubricating fluid from the axle to leak, possibly reaching the tires.
- OC. A leaking hub cap gasket: This gasket is designed to keep lubricants sealed within the hub, and if it leaks, oil can spill out, appearing on the tire.
- OD. A leaking wheel seal: This is the most common source of leaks in a brake assembly, where the seal around the wheel bearings fails, causing wheel bearing grease to spill out.
Determining the cause requires careful examination of these components, but typically, if you observe oily fluid specifically, option OD. A leaking wheel seal is a common issue to consider first.
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