The Jacobs Engine Brake or Jake Brake for short, alters a semi-truck's valve timing so that the engine helps slow it down and reduces the forces placed on the truck's standard brakes. A modern ...

The Jacobs Engine Brake or Jake Brake for short, alters a semi-truck's valve timing so that the engine helps slow it down and reduces the forces placed on the truck's standard brakes.

Not all braking systems on semis have to be loud to be effective. Exhaust brakes make a fraction of the noise that compression brakes do, here's how they work.