On Wed, 6 Jun 2018 06:59:53 -0400, "Mr. Luddite" wrote:



Those Jake brakes are really obnoxious, ought to be totally outlawed
in my opinion.


They are loud but you have to remember that a diesel, unlike a gasoline
engine, does not provide any engine braking when you take your foot
off the gas/fuel pedal. Going down a hill a diesel powered truck will
just keep accelerating and truckers would be replacing expensive brakes
often.



In 'tow/haul' mode, mine will downshift to slow down if I have the cruise control at a slower speed.
Also, going downhill and hitting the brakes will cause it to downshift.