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.Following up on one of the original questions about whether brake lights come on with exhaust brake: i listen a lot on CB when on road trips. I heard a couple of CB'ers laughing about the 18 wheeler descending a long grade with his brakes on continuously. They were laughing that his brakes would be toast before he got to the bottom. But he was listening and told them his brake lights come on when his exhaust brake was applied, and he was not dragging his brakes. So some 'big trucks' do activate brakes with Exhaust brakes.
Not that I know of - more specifically - my trucks do NOT turn on the brake lights when the PAC or Jake Brake is on and you back out of the throttle.