Hi There,
In your article What are “jake brakes” and why are they prohibited in some locations? there is a very good link-to url to find more detailed information regarding the JakeBrake and noise. Environmental health and safety | Jacobs Vehicle Systems
Thanks!
Jacobs Vehicle Systems
Welcome to the Straight Dope Message Board, and thank you for your response to this column(link provided for the benefit of those who haven’t seen the original column.)
I work for a trucking firm here in Portland, Oregon. I don’t know about our owner-operators, but I know for a fact that the company tractors use authentic JakeBrakes, and they are not that noisy at all.