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Old 07-21-2016, 01:58 PM   #1
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Difference in braking between Exhaust Brake and Tow/Haul Mode?

We have been towing this year with the Tow/Haul button on, and the Exhaust Brake on.
For braking (slowing down) purposes, don't these two features basically do the same thing? Down-Shift to help slow the truck/camper?
All we hear in the truck is a high RPM, rev'd engine. Not much exhaust noise.
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Old 07-21-2016, 06:38 PM   #2
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My understanding is that the tow/haul mode is for going, while the exhaust brake is for stopping. The tow/haul mode, I think, adjusts the shift points so you're not trying to tow a heavy load in too high of a gear. You might also want to think about setting the +/- button on the shift lever so the transmission never goes higher than 5th gear, if you'll be encountering any nasty hills.
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Old 07-21-2016, 06:41 PM   #3
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Some trucks have a seperate switch for engine braking. Others turn it on when the Tow/Haul button is pressed. Not sure which category your truck falls. Tow Haul mode also changes the shift points on most vehicles for towing.
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Old 07-21-2016, 06:51 PM   #4
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Diesel do not have a throttle body as do gasoline engines to control RPM thus diesels by fault are unable to slow you down by de-excelleration as a gasoline engine can. Diesels have an jake brake or exhaust brake to restrict the air leaving the engine thus slowing you down.

https://en.wikipedia.org/wiki/Engine_braking
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Old 07-21-2016, 08:00 PM   #5
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I use tow haul when starting off on a hill or when slowing down with the exhaust brake on. Tap the brake pedal and let the engine and tranny do the rest. Saves on brakes.
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Old 07-21-2016, 08:31 PM   #6
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2 completely different things, and both are effective in aiding with braking/slowing. Use them both all the time when towing. No reason you would not want too have the best possible braking and have control of your speed on downgrades.
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Old 07-22-2016, 06:05 AM   #7
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Dave nailed it. The reason you hear "high RPM" is because the transfer is in a lower gear to help slow the truck. Once the lower gear engages and locks the TC the exhaust brake will activate and further slow the truck. In all its a great system. I just gave my Ram a test last week in the Smokey Mountains of Tennessee and NC... it worked awesome!
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Old 07-22-2016, 07:07 AM   #8
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Quote:
Originally Posted by shorthorn View Post
Dave nailed it. The reason you hear "high RPM" is because the transfer is in a lower gear to help slow the truck. Once the lower gear engages and locks the TC the exhaust brake will activate and further slow the truck. In all its a great system. I just gave my Ram a test last week in the Smokey Mountains of Tennessee and NC... it worked awesome!

Try this the next time you are going down a steep hill, set the truck in cruise at the speed you want to descend at, you will never touch the brakes. You don't have to have the camper hooked up, besides the truck doesn't know when the camper is behind you or not


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Old 07-22-2016, 02:18 PM   #9
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Yep... Spock, I did use the Auto mode as u describe... it worked wonderfully
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Old 07-22-2016, 02:43 PM   #10
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A Duramax exhaust brake is not designed to make noise like you hear on a Kenworth. The Duramax runs much more quiet than Cummins or Powerstroke and that carries over to the exhaust brake. I always engage tow / haul and exhaust brake when towing. The stopping power with this setup is incredible compared to any other pickup truck I have driven.
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