CDL Combination Vehicles TestInspecting Combination VehiclesMedium
A driver is conducting a pre-trip inspection of a combination vehicle. They observe that the air compressor drive belt is frayed and has several cracks. What is the most appropriate action to take?
- AAdd more engine oil, as this can temporarily reduce belt strain.
- BReplace the belt immediately before operating the vehicle.
- CContinue the trip, but monitor the air pressure gauges frequently.
- DTighten the belt tension and proceed with caution.
Show answer & explanationAnswer & explanation
Correct answer: B. Replace the belt immediately before operating the vehicle.
A frayed and cracked air compressor drive belt indicates significant wear and a high risk of failure. A failed belt would lead to a loss of air pressure for the braking system, making the vehicle unsafe to operate. Immediate replacement is necessary.
Why the other options are wrong
- A. Adding engine oil has no effect on the condition or strain of the air compressor drive belt.
- C. Continuing the trip with a damaged belt is extremely dangerous as it could fail, leading to loss of air brakes.
- D. Tightening an already damaged belt will not prevent its impending failure and could accelerate it.
Air Compressor Belt Inspection
Checking the air compressor drive belt for proper tension, cracks, frays, and other signs of wear during a pre-trip inspection.
- Cracks or frays indicate imminent failure.
- Proper tension is crucial for compressor operation.
- A failed belt leads to loss of air pressure for brakes.
Memory trick: No air, no brakes, no go!