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PAC BRAKE vs.  JAKE BRAKE

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Tom Rogers:
I'm confused .... I have a 2006 Monterey with C9. When I had the valves adjusted I looked down into the engine compartment. I asked the mechanic to point out various parts of the motor. He pointed to the braking system And on the housing it said Jacobs Brake ..... is this not a "Jake Brake"???

Gerald Farris:
Jake brake is a term commonly used for an engine compression brake because the design was pioneered by Jacobs Vehicle Systems. An engine compression brake is located on the overhead (valve train) and under the valve covers so it is not visible until the valve covers are removed. The engine compression brake operates by opening the exhaust  valve momentarily as the engine reaches the top of the compression stroke, therefore turning the engine into an air compressor.

Likewise the 'exhaust brake' is commonly called a pac brake because Pacbrake Corp. was one of the first developers of the exhaust brake, although both manufactures now market both designs.

The exhaust brakes that are used on the new engines with a diesel particulate filter is a variable geometry turbocharger that uses the turbocharger to restrict the exhaust instead of the valve that was used on the previous engines.

Gerald

LEAH DRAPER:
Am glad to see that I am NOT the only one with confusion about these braking systems, HOWEVER, I have to say that I am NOT impressed with the new DPF  systems interaction with the the turbo charger for it's braking ability.  Quite honestly it scares the HELL out me going down grades!  I think it is a real safety issue.  I will grant that my experience with this new brake is not great at this point and hopefully I'll become more skilled.  

Leah

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