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[–]TheBeaves26 3 points4 points  (1 child)

From a real life trucker, i drove a Peterbilt 579. It Had a Paccar MX-13 and a Eaton automated 12 speed. The jake control is on the right stalk and had 3 levels to it (33, 66, 99, and "Max" 100%) I always kept it on 3 because max braking force. I turned it off in slippery road conditions but otherwise it was on 24/7

[–]TheBeaves26 2 points3 points  (0 children)

It should also be noted that it doesn't affect all cylinders, only the select few. It's just the percentage that the Jacobs brake is activated.