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Breakaway torque is the rotating force required to break the head loose, going in the same direction as applied-tightening. This will usually give a value HIGHER than the original tightening torque because dynamic (when the bolt was tightened) is lower than static (when you try to break loose the bolt head). This is how it is defined by torque testing standards. If the breakaway is measured in reverse (loosening), you will usually get even higher readings because the bolt head generally digs in and forms small burrs and indents THAT ARE DIRECTIONAL-like a ratchet. It is incorrect to check breakaway by loosening.
A âJake Brakeâ is an engine compression release brake used especially for steep hill downgrades. The Jake Brake opens the exhaust valves when the piston is near top dead center (where ignition normally occurs). On the upstroke, the piston compresses the air in the cylinder to 1/15th its original volume, which creates drag on the engine. The Jacobs Engine Brake then releases the compressed air and the energy stored in it before it can push back on the piston during the down stroke. The Jake Brake turns a power producing engine into a power absorbing air compressor and in turn, causes the truck to slow down.