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Old 09-20-2021, 10:28 PM   #1
Junior Member
Monaco Owners Club
Retired Fire Service RVer's
Join Date: Mar 2021
Posts: 18
Loud leaking air sound

Was driving along at highway speed when I heard a loud pop and what sounded like air escaping. I pulled over and quickly found that the air sound was coming from a small hole on the front of a small rectangular box mounted on the firewall near the drivers side. It had a line attached to the top of it coming from a spherical black ball like unit also mounted on the firewall. My brakes were not affected however it did take much longer to build up air pressure so that I could release the parking brake. Once underway, as long as the RPMs were above idle, the low air pressure light stayed off. The hissing was still there however. I haven't a clue what the items on the firewall are or what they do. Any help is appreciated. TIA.
John and Janet
36 Ft 2001 Monaco Knight
Cummins 5.9 pusher
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Old 09-20-2021, 10:49 PM   #2
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Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 24,737
If your low air warning is on your very close to the brakes being effected .
Maybe even being stopped on the road if the park brake comes back on .

Have to ask what chassis your coach is built on ?
And can you take and post pictures ?

Info on posting photos in this link.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 09-20-2021, 11:03 PM   #3
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As hard as I tried not to say it Skip, some people are just blessed!
Dave & Kandi Stagecoach Nev. "Big Blue"
2001 Holiday Rambler Admiral 30D w/ 2nd slide
2000 P32 7.4 4L80E wide track J71 18/21K
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Old 09-21-2021, 04:07 AM   #4
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Location: Orlando, Florida
Posts: 5,568
What you describe sounds like the "vacuum pump" which is used to make vacuum for controlling the dash AC/vent doors. The round plastic (sometimes coffee can shaped) thing is the vacuum reservoir.
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Mike --- 2005 Beaver Patriot Thunder CAT C13 525HP --Links below to my OneDrive docs---
*Monaco Chassis, Engines, Problems!AtvAXw_lfqbToxXYREK9YdBP08Jn
*Monaco Wiring Diagrams!AtvAXw_lfqbTm0WTuuNqpn9a8hCh
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air, leak

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