# jake brake

> English word · Noun

## Definitions
1. 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.

## Etymology
From JakeBrake, an abbreviation for the Jacobs brand name of engine braking systems.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/jake-brake