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After connecting the air lines, how can you check the connections for leaks before driving?
- A.Leaks cannot be detected until the vehicle is at highway speed
- B.Charge the system, then listen at the gladhands and along the lines, and watch that pressure holds; also apply the brakes and listen again for leaks under application pressure
- C.Shake each gladhand once; if it stays on, it is sealed
- D.The ABS lamp going out proves there are no air leaks
Correct answer
B. Charge the system, then listen at the gladhands and along the lines, and watch that pressure holds; also apply the brakes and listen again for leaks under application pressure
Why
Many leaks only speak up under pressure, and the applied-brake check pressurizes the service side as well. Your ears and the pressure gauges together are the leak test, and they work before the vehicle moves.
Manual topic: Combination Vehicles - Air Lines and Gladhands · From the Combination Vehicles practice bank (CV-240).