Jake Brake (Engine Brake)
A compression-release braking system that uses the engine to slow the truck.
Definition
A Jake brake (named after Jacobs Vehicle Systems, its inventor) is an engine braking system that opens exhaust valves at the top of the compression stroke, releasing compressed air and creating retarding force. This slows the truck without using the service brakes, reducing brake wear and fade on long downhill grades. Many residential areas prohibit Jake brake use due to noise. Proper use of engine braking is a critical skill for mountain driving.
Why it matters to you
The engine brake saves your service brakes on long descents, which is the difference between arriving at the bottom of a grade in control and arriving in a runaway lane. Learn the gear-and-brake technique for the mountains you run. Also watch for the signs: many towns ban engine braking, and the fine is easy to avoid by lifting off early.
FAQ
What does Jake Brake (Engine Brake) mean?
A compression-release braking system that uses the engine to slow the truck.
Why does Jake Brake (Engine Brake) matter to a driver?
The engine brake saves your service brakes on long descents, which is the difference between arriving at the bottom of a grade in control and arriving in a runaway lane. Learn the gear-and-brake technique for the mountains you run. Also watch for the signs: many towns ban engine braking, and the fine is easy to avoid by lifting off early.
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