My son has a Freightliner FL120, 2003, with a Cummins N-14. He's an owner/operator hauling inter-modal containers. I just asked him about how his cruise/Jake play together. He said his Jake (forgot to ask but pretty sure it's a 2 stage Jake) works the same when the cruise power is turned on or off. He said if he's got cruise engaged and starts going down a hill the Jake will activate when the truck gains about 5 mph over the set speed.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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