King of the Highway: The Ultimate Big Rig & Semi-Truck Operations Challenge

How does a Jake Brake (compression-release engine brake) slow down a semi-truck?

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Correct!

Incorrect!

A Jake Brake opens the exhaust valves near the top of the compression stroke, releasing trapped compressed air into the exhaust. Instead of returning power to the piston, the energy is wasted, slowing the truck without wearing service brakes.

How does a Jake Brake (compression-release engine brake) slow down a semi-truck?

By compressing fuel in the return lines

By releasing compressed air from cylinders

By clamping a brake rotor on the drive shaft

By restricting intake air at the turbo filter

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