My Question: What makes sneezing air discharge noises on heavy trucks and buses?

Question:

What makes sneezing air discharge noises on heavy trucks and buses?

Answer by car kid
it has pressure on the hydrualics that has to release when they stop

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5 Responses to My Question: What makes sneezing air discharge noises on heavy trucks and buses?

D_Icon says:

November 12, 2011 at 8:37 am

I think it’s the air brakes. They work using compressed air and when the brakes are released, so is the air. It could also be the pneumatic lifts if you are talking about passenger buses. They raise and lower the bus at the curbs for ease of getting on and off of the bus.
ugly joe says:

November 12, 2011 at 8:55 am

Either the air brakes if the truck has just stopped or is about too leave, if it is parked and idling it most likely would be the air dryer cycling.
KAM says:

November 12, 2011 at 9:09 am

its called a air dryer,it spits out the moisture in the air system on buses and big trucks so in cold weather the air lines don’t freeze.compressed air produces water in the system which is stored in air tanks on the frame.and if didn’t have the air dryer system then the driver would have to drain the water from the tanks daily with the dryer they don’t have to do it as much..and that is the noise you are hearing the dryer system is expelling the water from the system.
shjf47 says:

November 12, 2011 at 9:55 am

All vehicles with air brakes make that noise. When the air compressor builds air above approx. 120 pounds of air the air governor releases some air, making a loud hissing or sneezing noise. It is not anything to be concerned about.
yousuck12342 says:

November 12, 2011 at 9:57 am

Some of these are right but I figured to let you know the whole answer.

Heavy trucks use compressed air to operate the brakes. An on board air compressor builds air pressure in multiple air tanks. When the governed air pressure is reached it sends a signal to the air dryer to purge the moisturee that it has captured. this is one possible answer depending on when you hear the noise.

Air is also used to release the parking brakes so if you hear a loud hiss it could be that the parking brake has just been applied so the air that was holding the spring was released so that the parking brake spring could apply pressure to the brakes shoes.