CDL Combination Vehicles TestCoupling and UncouplingMedium
A driver is performing a visual inspection of the air lines after coupling. They notice that the glad hands are connected, but there appears to be a slight leak audible at one of the connections. What is the immediate correct action?
- ATighten the glad hand connection and recheck for leaks.
- BProceed with the trip, as slight leaks are common and usually self-seal.
- CApply an approved sealant to the leaking connection and recheck.
- DDisconnect and reconnect the glad hand, ensuring a clean and tight fit.
Show answer & explanationAnswer & explanation
Correct answer: D. Disconnect and reconnect the glad hand, ensuring a clean and tight fit.
A slight air leak at the glad hand connection indicates an improper seal. The most effective immediate action is to disconnect, inspect the rubber seals (gaskets) for damage or debris, clean them if necessary, and then reconnect, ensuring a proper, tight fit. Simply tightening might not resolve a misaligned or dirty seal.
Why the other options are wrong
- A. Tightening might not fix a misaligned or damaged seal; a full reconnection is more thorough.
- B. Any air leak in the braking system is a defect and must be addressed immediately; it will not self-seal.
- C. Sealants are not approved for glad hand connections and can cause further problems or mask a more serious issue.
Air Line Leak Correction
Any audible air leak at glad hand connections requires immediate attention. The correct procedure is to disconnect, inspect seals, clean, and then reconnect for a proper, airtight fit.
- Air leaks compromise brake system pressure.
- Gaskets must be clean and undamaged.
- Proper reconnection ensures a tight seal.
Memory trick: Hear a Hiss? Re-Connect, Don't Miss.