Wow I am not a huge freightliner fan but I will say that it sounds like there's are set up a little easier to use.
Sorry wish I could help.
It's got to do with parameter settings. Jakes are considered dangerous in slippery conditions. If the Jake comes on and slows the tractor only, there is a chance of jackknifing as the trailer continues to push. If the Jake only operates when brakes are applied evenly around the entire vehicle, there is less of a chance to jack knife. These parameters can be changed with the proper software.
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In the international trucks Ive driven,you would need to lightly apply brakes to engauge the jake,they would turn off with throttle,then you would need to reapply foot brake,to engauge them again...hated that system.