What Noise Are Trucks Making?
11-02-20, 07:07 PM
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What Noise Are Trucks Making?
Those of you who are familiar with larger trucks might know this. There are a lot of “heavier” trucks on the roads around my house.......dump trucks, tractor trailers, garbage trucks etc. We have a lot of growth with a lot of construction going on. The landfill is not too far away and gravel pits, sand pits and asphalt plants are very close by. We are also just off I-85 and there are 3-4 trucking terminals on our exit. Plus there are a lot of 2 lane roads that we share!
A lot of times I’ve noticed that as some of those vehicles pass me the vehicle makes a loud, short hissing sound. It’s not the sound of Jake Brakes, but sounds like a burst of air at high pressure being released.
Is that just part of the normal operation of the vehicle or could it be something the driver is doing trying to “scare” or irritate me? Any ideas?
A lot of times I’ve noticed that as some of those vehicles pass me the vehicle makes a loud, short hissing sound. It’s not the sound of Jake Brakes, but sounds like a burst of air at high pressure being released.
Is that just part of the normal operation of the vehicle or could it be something the driver is doing trying to “scare” or irritate me? Any ideas?
Last edited by jppe; 11-03-20 at 06:24 AM.
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11-02-20, 07:23 PM
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The trucks we use to move concert equipment around have some kind of air release that basically just sounds like the vehicle hit a nail and punctured a tire. It happens mostly when the vehicles are approaching a full stop, but I'm not sure if it also happens at other times.
I suspect this is what you are describing and, no, it's not the driver messing with you. It's some kind of necessary function that I cannot describe because I am not a driver. RELAX!!
I suspect this is what you are describing and, no, it's not the driver messing with you. It's some kind of necessary function that I cannot describe because I am not a driver. RELAX!!
11-02-20, 10:18 PM
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Truck brakes are held OFF by air pressure. If the truck loses air the brakes go full on. There is an air tank that keeps air pressure up and the sound you hear is the tank bleeding off excess air pressure as there is a pump adding air to the all the time.
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11-02-20, 11:16 PM
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The noise you are describing is probably the air dryer purging. Large trucks with air brakes use lots of air. The air is first filtered and some is exhausted to remove moisture from the system. Air brakes work better with clean dry air. Especially when temperatures are below freezing.
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11-03-20, 09:41 AM
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I think I've heard the hissing release of air that others are describing on trucks that are just idling in the parking lot with no driver. I think it's not something that necessarily happens predictably.
11-03-20, 10:57 AM
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Thanks folks! I suspected it had something to do with the the air brake system and I appreciate you confirming it.
Now if we can just take care of some of the “rolling coal” diesel pickup trucks!!!
Now if we can just take care of some of the “rolling coal” diesel pickup trucks!!!
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11-04-20, 01:24 PM
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[QUOTE=macd55;21772846]Truck brakes are held OFF by air pressure. If the truck loses air the brakes go full on.QUOTE]
Just like a freight train.
One way thieves like to disable a slow moving freight train is to break the air hose connection between two cars. That will send the train into emergency breaking. Do it far back on a very long train and it will take the engineering a while to walk the train to find the broken connection. That, in turn, leaves time for the thieves to break into a car and steal stuff.
Just like a freight train.
One way thieves like to disable a slow moving freight train is to break the air hose connection between two cars. That will send the train into emergency breaking. Do it far back on a very long train and it will take the engineering a while to walk the train to find the broken connection. That, in turn, leaves time for the thieves to break into a car and steal stuff.
11-04-20, 01:38 PM
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11-04-20, 05:41 PM
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Just like a freight train.
One way thieves like to disable a slow moving freight train is to break the air hose connection between two cars. That will send the train into emergency breaking. Do it far back on a very long train and it will take the engineering a while to walk the train to find the broken connection. That, in turn, leaves time for the thieves to break into a car and steal stuff.
One way thieves like to disable a slow moving freight train is to break the air hose connection between two cars. That will send the train into emergency breaking. Do it far back on a very long train and it will take the engineering a while to walk the train to find the broken connection. That, in turn, leaves time for the thieves to break into a car and steal stuff.
