During a commercial motor vehicle pre-trip walkaround, a driver must accurately evaluate specific visual indicators on tires, wheels, and rims. Match each wheel or tire inspection observation with its correct mechanical hazard or regulatory safety assessment.
- Rust streaks radiating outward from the wheel lug nutsIndicates loose lug nuts or fastener movement across the hub face
- Shiny, polished metal showing around the wheel bolt mounting holesSignals active wheel rim slippage and distorted or elongated bolt holes
- Hairline cracks extending between hand holes on a steel disc wheel rimRepresents structural fatigue requiring rim rejection; welding repairs are prohibited
- Road grit and debris accumulation inside an uncapped tire valve stemCan contaminate or damage the internal valve core, causing progressive pressure loss
Answer
Rust streaks match with loose lug nut movement; shiny metal around bolt holes matches with wheel rim slippage and distorted holes; cracks between rim holes match with structural fatigue and prohibited welding repairs; uncapped valve stems with debris match with potential valve core damage and progressive deflation.
Each inspection observation correctly pairs with its specific mechanical cause: rust streaking indicates loose lug nuts; shiny metal marks indicate rim movement against hub studs; rim cracks indicate unrepairable structural fatigue; and uncapped valve stems risk core damage and air loss.
Step-by-Step Solution
Key Concept
Identifying visual failure indicators, structural defects, and safety hazards during tire, wheel, and rim inspections.
Estimated Time:1m 30s