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What Jake brake do I need?

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I would appreciate your olds help and helping me find out what Jake brake a friend of my needs for his 2001 Mack rd688S dump truck

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I believe you will need to look for a model 675A Jake.

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It’s a possibility that the camshaft will have to be replaced when adding a engine brake . Mack has a few service bulletins out there on adding Jacobs engine brakes to the ETECH style engines . 

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Not a " 675A" for sure, that is a two (2) valve brake. Most likely "680" series but check Jacobs website as there are multiple choices and you will need S/N# of engine. 

 

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Let me know which ones you end up needing.  I have a whole pallet of good take off Jakes.  

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