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Well.... now ya got me... how can making the exhaust brake inoperative under cruise be a safety feature??
You touch the brake... the cruise dumps... the exhaust brake is enabled...
You select manual, the exhaust brake engages when you lift the foot off the accelerater... you can't coast exhaust brake armed....
With the cruise/brake linkage, you can coast, the exhaust brake doesn't engage until you touch the brake. On a long hill , you use the manual exhaust brake engage, so the trailer brakes don't activate. You get a lot more service out of the exhaust brake... no fuss... no muss...
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