rjwmoto

2000 Mack CH613, E7 400, brakes charged, engine off, this cut off airline next to the coolant reservoir is making a humming noise and is leaking air. I can put my finger over the hose and it stops the air leak, but can still hear the humming noise faintly. See attached video, it's coming from the larger hose. Any ideas? Should I just cap this line off? Thanks in advance for any help. IMG_1570.MOV