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Anyone know if the brake lights light up when the exhaust brake is slowing the truck down? And how about if adaptive cruise control is doing the slowing? 2020 RAM 3500. Thanks.
 

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Shouldn't.......but you could always adjust your mirrors to see behind you and drive around with the Jake brake on.......
 

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Not likely. The lights are activated from a switch either at brake pedal arm or some manufactures have used a pressure switch on master cylinder.
 
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