CDL Air Brakes TestInspecting Air Brake SystemsHard
A driver is inspecting the air compressor's drive belt. Which of the following conditions would require immediate attention or replacement of the belt?
- AThe belt has approximately 3/4 inch of play in the center of the span.
- BThe belt is shiny and smooth on the top surface.
- CThe belt has cracks visible on the ribbed surface.
- DThe belt shows slight glazing on the sidewalls.
Show answer & explanationAnswer & explanation
Correct answer: C. The belt has cracks visible on the ribbed surface.
Cracks on the ribbed surface of the belt indicate severe wear and potential failure, requiring immediate replacement. Excessive play, slight glazing, or a shiny top surface may indicate wear but are not as critical as visible cracks.
Why the other options are wrong
- A. Approximately 3/4 inch of play is generally within acceptable limits for belt tension (typically 1/2 to 3/4 inch).
- B. A shiny and smooth top surface is normal and does not indicate a defect.
- D. Slight glazing can occur with normal use; while it indicates some wear, it's not as critical as cracks.
Air Compressor Drive Belt Inspection
Checking the condition and tension of the belt that drives the air compressor to ensure continuous air supply.
- Look for cracks, frays, or excessive wear.
- Check for proper tension (typically 1/2 to 3/4 inch of play).
- A failing belt can lead to loss of air pressure.
- Replace immediately if cracked or severely worn.
Memory trick: Belt's cracked? Air's attacked!