I do understand that it’s compressed air, but what exactly is happening when it makes that sound? After driving one around for a few days (moving truck), it seems to be somewhat randomly occurring.
In: Physics
Large vehicles use air brakes which make that noise at different times for example:
When the brake pedal is pressed air pressure applies the brakes to slow the vehicle.
Air has to be replenished in the system so the compressor will kick on to fill the air tanks, the TSSS noise is the valve closing to stop taking in outside air, really just the compressor turning off.
The other time that sound is common is when parking. Large vehicles use “spring brakes” as a parking brake. Air has to be constantly supplied to release the brakes so when the parking brake is applied all the air that holds the spring brakes open leaves the canister that contains the spring brake.
Hope that’s not too much, or too complicated.
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