On Engine Brake Noise. Jake Brake ® is a registered trademark of Jacobs Vehicle Systems, Inc. . Copyright Jacobs Vehicle Systems December, 2000. Overview. Engine Brake Description & Use Vehicle and Engine Brake Noise Focus on Mufflers & Configuration What is Jacobs Doing
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Jake Brake® is a registered trademark of Jacobs Vehicle Systems, Inc.
Copyright Jacobs Vehicle Systems December, 2000
Jacobs Model 340B for Caterpillar 3406E Engine
North American Engine Brake PenetrationClass 8 Trucks
brakes are also used on
buses, vocational and
Engine Brake Noise is a component of exhaust noise and is similarly controlled with a functioning muffler.
Jet Aircraft @ 50 ft.
Loud concert for an attendee
Truck with no muffler @ 50 ft.*
Truck with OEM Muffler @ 50 ft.*
Normal Conversation @ 3 ft.
Threshold of Hearing
* Range of Truck Noise Level in Full Acceleration and Full Braking
Not a large difference between engine brake and acceleration sound levels, but a very noticeable difference when the engine is properly muffled.