How Loud Is the Sound of Truck Air Brakes Releasing That Whooshing Noise When They Are Stationery?

Discussion in 'Support' started by Rust, Oct 13, 2016.

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    1. Rust

      Rust Member

      Tinnitus Since:
      You know, that loud whoosning sound they make when the air or hydraulic brakes release when trucks are waiting in traffic.

      Today a truck made that sound near me, and it felt extremely loud!

      I wonder if anyone else has had experienced this?


    2. Julien87

      Julien87 Member

      Tinnitus Since:
      Cause of Tinnitus:
      Exposure to loud sound (concert)
      I experienced this a few weeks ago. I was really startled when it happened but I think it's mainly because this sound surprised me. I don't think it's as loud as a honk and I don't think it can damage the ear.
    3. Ecip

      Ecip Member

      Edmonton, AB
      Tinnitus Since:
      Cause of Tinnitus:
      Still unknown... possibly noise exposure?
      Hey there. (ex) Truck driver here.
      It's loud but not too loud.. 90dB or so, I'd say, at its peak. Just a guess though, never measured it.

      The brakes aren't releasing, quite the opposite actually. Brake pods have very strong springs inside of them that keep the brakes on/locked. When air pressure is introduced, it forces the spring to compress and release the brakes. When the parking brake is pulled, it purges the air to atmosphere, and the springs force the brake shoes onto the drums. This is a safety feature; should the tractor lose all air in an air leak, perhaps, then the brakes automatically apply.
    4. Coyotesheaven

      Coyotesheaven Member

      Tinnitus Since:
      Cause of Tinnitus:
      Accoustic Trauma, then Migraines and something else
      I've had this happen when I was standing right next to a bus once; set off a terrible migraine and a roaring noise in my ear back in December, along with hearing loss. Not sure if a one time exposure is particular will cause permanent damage outside of exceptional cases like mine.

      I would say though that you are definitely looking at a noise over 90 db, but most likely no greater than 110 db. You should definitely wear earplugs anywhere near loud trucks and/or buses. Those noises are dangerous, but most likely only over a somewhat longer time frame.
      • Agree Agree x 1

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