CDL Air Brakes TestInspecting Air Brake SystemsMedium
During a pre-trip inspection, a driver checks the air lines for proper connection and condition. What type of damage to an air line is most likely to cause a slow, continuous air leak that might only be noticeable over time?
- AA severe kink in the air line, restricting airflow.
- BA large, obvious crack in the air line tubing.
- CA complete rupture of the air line.
- DA loose or improperly seated fitting.
Show answer & explanationAnswer & explanation
Correct answer: D. A loose or improperly seated fitting.
A loose or improperly seated fitting is a common cause of slow, continuous air leaks. A small gap or poor seal allows air to escape gradually, which might not be immediately obvious but will cause pressure loss over time. The other options describe more severe, immediately noticeable or flow-restricting issues.
Why the other options are wrong
- A. A severe kink restricts airflow but doesn't necessarily cause a leak, unless the kink also causes a rupture.
- B. A large, obvious crack would typically cause a significant and easily detectable leak, not a slow, continuous one.
- C. A complete rupture would result in a rapid, catastrophic loss of air pressure, not a slow leak.
Air Line Leaks
Any unintended escape of compressed air from the air brake system, which can compromise braking efficiency.
- Can be caused by damaged hoses, loose fittings, or cracked components.
- Slow leaks are harder to detect than rapid ones.
- Use soapy water to find small leaks.
Memory trick: Fittings are fickle, small leaks trickle!