Home › CDL Practice Tests › Combination Vehicles Questions › Question 17
What should you inspect on gladhand seals before connecting the air lines?
- A.They should be removed for better air flow
- B.Only the tractor side matters
- C.They should be present, clean, and not cracked or badly worn, so the connection does not leak
- D.Seals are decorative and never affect braking
Correct answer
C. They should be present, clean, and not cracked or badly worn, so the connection does not leak
Why
Worn or missing seals leak air at the coupling, which can drop trailer air pressure and weaken braking. Replacing a bad seal on the spot is a small fix for a serious problem.
Manual topic: Combination Vehicles - Coupling · From the Combination Vehicles practice bank (CV-017).