CDL Combination Vehicles TestCombination Vehicle Air BrakesEasy
During a pre-trip inspection, a driver observes that the air compressor drive belt is frayed and has several cracks. What is the most appropriate action?
- ATighten the belt tension to compensate for the fraying and cracks.
- BContinue driving, but plan to replace the belt at the next scheduled maintenance.
- CImmediately replace the drive belt before operating the vehicle.
- DApply belt dressing to temporarily fix the damage and continue the trip.
Show answer & explanationAnswer & explanation
Correct answer: C. Immediately replace the drive belt before operating the vehicle.
A frayed and cracked air compressor drive belt is a critical defect. If this belt fails, the air compressor will stop working, leading to a loss of air pressure and eventually loss of braking capability. It must be replaced immediately for safety.
Why the other options are wrong
- A. Tightening a damaged belt may cause it to fail sooner or damage other components; replacement is the only safe solution.
- B. Driving with a damaged compressor belt is highly dangerous due to potential loss of air pressure and brakes.
- D. Belt dressing is not a repair for frayed or cracked belts; it's a temporary measure for squealing and won't prevent failure.
Air Compressor Drive Belt Inspection
Regular inspection of the air compressor drive belt for damage (fraying, cracks, excessive wear) is crucial, as a failed belt will lead to loss of air pressure and braking capability.
- Inspect for fraying, cracks, and proper tension.
- Failure leads to loss of air pressure.
- Requires immediate replacement if damaged.
Memory trick: Frayed belt, no air, no brakes, beware!