Truck Air Brakes: Listen & Download Truck Air Brakes .mp3 Error! Change your browser, please! ⇓ Download Balloon descent ⚠ Helium balloon ⚠ Mask breathing ⚠ Compressor discharges air, Construction ⚠ Air is bleeding through a hose ⚠ Balloon inflating ⚠ Air compressor operation ⚠ Air pressure ⚠ Air flow ⚠ Truck Air Brakes ⚠ Air release with a loud whistling creak, ⚠ Small compressor blowing air ⚠ ★★★★★