On 6/6/2018 7:42 PM, John H. wrote:
On Wed, 6 Jun 2018 15:49:36 -0400, "Mr. Luddite" wrote:

On 6/6/2018 12:35 PM, John H. wrote:
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.


I understand but still, a diesel offers no engine braking like a gas engine.


I haven't figured out how it works, but the engine RPM goes up as the truck is slowing down -
without me using the brake. It sure sounds and feels like the engine is slowing the truck down
somehow.



Some HD GM and Ford pickups have an exhaust brake that works with the
turbocharger. It's not a "Jake" brake and is not noisy like those on
big trucks. The Ford F-350 diesel I had (2005) had one. Mine had
no "control" or off/on switch like in the video (below).

https://www.youtube.com/watch?v=fLLOE2sV6SI