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jake brake

(slang) Especially on trucks, an engine compression release braking system that opens the exhaust valves in each cylinder near the top of their compression strokes in order to slow the vehicle; an eng

ˈd͡ʒeɪk ˈbɹeɪk111 viewsLast reviewed Jun 29, 2026+ Add a definition
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#1·Apr 27, 2026

(slang) Especially on trucks, an engine compression release braking system that opens the exhaust valves in each cylinder near the top of their compression strokes in order to slow the vehicle; an engine retarder.

Origin: From JakeBrake, an abbreviation for the Jacobs brand name of engine braking systems. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
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