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<p>[QUOTE=&quot;JB7, post: 12372702, member: 339737&quot;]I would disconnect and plug off the air line at the piston mounted on the diffuser. This way the exhaust brake will not activate. You can&#039;t let the truck drive like that. Why not? Engine will run fine, just no exhaust brake. Then take it to a shop for diagnostics. You have spent thousands w/o fixing the problem. You state that your engine brake does not work either so that is another problem. So, the problem, at least in part is electrical. Are there any codes?[/QUOTE]</p><p><br /></p>

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