04-06-2022, 12:18 PM
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#1
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Admiral Douchebag
Join Date: Oct 2008
First Name: Tom
Location: Clermont, Kentucky
Posts: 71,932
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Re: Engine braking
Quote:
Originally Posted by shark
That occasional hissing sound you hear when you're by a truck or bus is from the pneumatic (air) system for the brakes. They use compressed air stored in air reservoirs that's generated by a compressor. They have a safety system that lets off some air sometimes to keep the pressure within limits.
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Thanks Ron. 
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