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Old 06-15-2012, 11:29 PM   #1
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Question Woah! Loud bang from left side!!!

Hi,
I firmly believe no question is a dumb one...please bare with me.
We just got our first diesel bus. We are super excited, but they taught us zero! So, my question is....after it starts up, there is a loud bang on the drivers side towards the rear. Despite the Tupperware bin of manuals my Hubbs is scouring for the answer....I thought I'd ask if anyone else has experienced it, or has a clue what it is. It has happened twice now. We start the vehicle, wait for the alarms for the....I dunno air?, then about 2 mins late - POW! Sounds like a backfire.
Help please! And thank you in advanced!
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Old 06-15-2012, 11:38 PM   #2
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Well, one possibility is that it is the air compressor releasing air when it reaches its maximum compression (usually when the air pressure reaches the 135-150 PSI range). It''s the compressor releasing any water and dirt that builds up when air is compressed in the air compressor.
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Old 06-15-2012, 11:48 PM   #3
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The psi reading is at 10....shortly after. Whats that? I'm really clueless! I'm so sorry, any info is so appreciated.
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Old 06-15-2012, 11:55 PM   #4
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So when it releases the air.....it sounds really loud....similar to a weapon discharge. Is that right?
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Old 06-16-2012, 12:01 AM   #5
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I presume you have air brakes and have 2 pressure gauges-one for the front brakes and one for the back brakes. When you first start your motorhome, if the air pressure is below a certain level (usually 50-60 PSI), an alarm should sound. Once the air pressure reaches a certain level (usually 125-135 PSI), the air compressor should stop and this is usually when the air compressor will 'whoosh' with a discharge. It can be a loud sound. What is the pressure when the alarms stop?
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Old 06-16-2012, 12:08 AM   #6
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Not sure where you live but most states and Canadian provinces require you to get a license to drive a vehicle with air brakes (sometimes referred to as air brake endorsements). You might want to find out if there are courses available to learn about air brake systems. Usually these are offered through truck driver training companies and they will teach you alot about how your air system works. My wife and I took a course and it taught us about all the components that make up our RV's braking system.
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Old 06-16-2012, 12:12 AM   #7
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Ok, it is 125 psi when the alarm stops. My Hubbs is laughing because your whoosh sounds like a gun! Lol it's not that whoosh similar to what I've heard from a city bus, it a POW like a freaking backfire! It makes you jump out of ur skin if your outside. :-(
We drove it from NJ to NC (bought in NJ) - but other than that, it's been in our driveway. Should we take it into a shop? It's brand new.
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Old 06-16-2012, 12:13 AM   #8
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It can be quite loud (yes, it could sound like a bang). You may also hear it occasionally when you are driving after you have used your brakes.
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Old 06-16-2012, 12:22 AM   #9
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The sound I hear from my air system isn't the kind of POW that you describe. However, if I were you, I'd contact the dealer or manufacturer to get their opinion.
Without putting yourself in danger, you might want to listen in the area where the loud sound is coming from to see if you can isolate its location. My bet is that it is coming from your air compressor.
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Old 06-16-2012, 09:58 AM   #10
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From time to time my coach will make a very load pop noise. Very different from the air release. What I have found it only happens when there is a excessive slope when you level your coach to camp. Then when you start up to move the air bags re seat them self. I have had it on the front of the coach. Like I said it only happened when it was a big slope and the suspension was stretched out.
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