Over 70% of heavy-duty trucks on the road — and 90% of all new ones — have engine brakes. Engine braking can improve control and safety as well as reduce maintenance costs and downtime by extending brake, tire and exhaust system life. Unfortunately, engine braking can increase vehicle noise by as much as 100%. Its harsh, staccato sound has moved many localities to pass ordinances outlawing engine brake use. Also, this noise can cause increased driver discomfort and fatigue, and with tandem ...

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