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What is the purpose of exhaust system brakes?

Updated: 8/21/2019
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7y ago

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They provide resistance to the engine crankshaft in order to help control speed on a downhill descent. Exhaust brakes and Jake brakes aren't one in the same... an exhaust brake restricts exhaust flow, while a Jake brake opens the exhaust port of the cylinder during the power stroke.

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7y ago
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7y ago

Usually found in larger trucks to slow the vehicle down without overheating the service brakes.

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