rjwmoto Posted October 23 Share Posted October 23 (edited) 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 Edited October 23 by rjwmoto Quote Link to comment https://www.bigmacktrucks.com/topic/74672-2000-mack-ch613-air-leaknoise/ Share on other sites More sharing options...
880joe Posted October 24 Share Posted October 24 I'm going to say your parking brake valve is probably bad. That leaking hose is an exhaust Quote Link to comment https://www.bigmacktrucks.com/topic/74672-2000-mack-ch613-air-leaknoise/#findComment-560664 Share on other sites More sharing options...
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