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Open Roads Forum  >  Fifth-Wheels

 > Jake Braking A 5er Down Long Steep Incline

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cummins2014

Utah

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Posted: 11/23/21 05:22pm Link  |  Quote  |  Print  |  Notify Moderator

JKJavelin wrote:

Cummins12v98, I believe this how the Ram engine brake works:
Full mode, just letting off the accelerator will activate the engine brake.
Auto mode, you must tap the brake pedal to activate the engine brake.
I prefer the Auto mode to prevent it slowing down all the time, so I am able to coast. My trailer weighs near 12k lbs.
JK


Of course depending on the hill , that’s exactly why I use cruise and it maintains the speed I set it , just let it do it’s thing . I’ve come off some very long grades doing that , with everything under control and maintaining a constant speed . None of this speeding up tapping brakes , only to repeat again , and again .

Travlingman

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Posted: 11/23/21 05:38pm Link  |  Quote  |  Print  |  Notify Moderator

Retired JSO wrote:

I tow in tow mode and use cruise control all the time with the exhaust brake engaged. The OP has a 2019 F-350, I have a 2018 F-350, my exhaust brake has no auto, it’s either on or off.


If your F-350 is a 6.7 diesel, then you have an auto mode. The first push on the exhaust brake is manual mode and the 2nd push of the button is auto mode. This started with the 2017 models.


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rhagfo

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Posted: 11/23/21 05:39pm Link  |  Quote  |  Print  |  Notify Moderator

ReneeG wrote:

Retired JSO wrote:

I tow in tow mode and use cruise control all the time with the exhaust brake engaged. The OP has a 2019 F-350, I have a 2018 F-350, my exhaust brake has no auto, it’s either on or off.


We have a 2011 F350 and the true engine compression brake (not exhaust) is only off or on with setting the Tow Haul Mode.


I agree with Ron, please explain all recent HD pickup use an exhaust brake, which uses some means of restriction of the exhaust gases.
Now PacBrake offered a Load Lash device for the Cummins 6.7, that was more like an engine brake.


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ReneeG

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Posted: 11/23/21 05:59pm Link  |  Quote  |  Print  |  Notify Moderator

rhagfo wrote:

ReneeG wrote:

Retired JSO wrote:

I tow in tow mode and use cruise control all the time with the exhaust brake engaged. The OP has a 2019 F-350, I have a 2018 F-350, my exhaust brake has no auto, it’s either on or off.


We have a 2011 F350 and the true engine compression brake (not exhaust) is only off or on with setting the Tow Haul Mode.


I agree with Ron, please explain all recent HD pickup use an exhaust brake, which uses some means of restriction of the exhaust gases.
Now PacBrake offered a Load Lash device for the Cummins 6.7, that was more like an engine brake.


It's not a true exhaust brake, but merely uses the transmission and the back pressure of the engine. It works and it's efficient, but Ram owners , I beleive, have true exhaust braking.


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philh

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Posted: 11/23/21 07:03pm Link  |  Quote  |  Print  |  Notify Moderator

2022 F350D adaptive cruise, driving from MI to FL,

Truck will downshift to hold speed going downhill. If that isn't enough, then EB kicks in, if that isn't enough, then the brakes are applied. It held downhill speed to 0 to + 2 mph. Uphill was a different story, it would drop to -5 before aggressively downshifting and getting deep into the power to bring the speed back up.

4x4ord

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Posted: 11/23/21 07:48pm Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

Auto mode is useless unless you are towing a lighter RV and smaller grades at least with RAM trucks.

I also set my cruise control at a lower speed to maintain the actual speed I want. It varies depending on how steep the grade is. I also on steep grades select the gear that puts me up near the redline for best braking.

I am glad I don't have the ability for the truck to apply my trailer brakes. I like controlling me descent with cruise and proper gear selection for the grade. I never use Auto mode, I have tried but found it useless for my large load.


Could there be something wrong with your truck? The EB on the Cummins should generate 60 lbs of back pressure on a steep grade with a heavy load regardless of whether it is set to auto or full on.


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blofgren

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Posted: 11/23/21 09:19pm Link  |  Quote  |  Print  |  Notify Moderator

4x4ord wrote:

Cummins12V98 wrote:

Auto mode is useless unless you are towing a lighter RV and smaller grades at least with RAM trucks.

I also set my cruise control at a lower speed to maintain the actual speed I want. It varies depending on how steep the grade is. I also on steep grades select the gear that puts me up near the redline for best braking.

I am glad I don't have the ability for the truck to apply my trailer brakes. I like controlling me descent with cruise and proper gear selection for the grade. I never use Auto mode, I have tried but found it useless for my large load.


Could there be something wrong with your truck? The EB on the Cummins should generate 60 lbs of back pressure on a steep grade with a heavy load regardless of whether it is set to auto or full on.


I think his load is 33-36,000 lbs so I don't think there's anything wrong with his truck. [emoticon]

I too only use full exhaust brake mode with my truck.


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4x4ord

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Posted: 11/23/21 10:35pm Link  |  Quote  |  Print  |  Notify Moderator

So long as you have a steep enough hill and or enough weight pushing you the auto EB will develop full back pressure during grade braking. Full on vs auto will not make any difference with a heavy trailer on a steep grade. If , during grade braking, cruise control holds your truck back better than auto EB does then it is because CC is applying your wheel brakes.

If you are using your EB to slow you down …. full on is the better choice. If auto is selected during deceleration the EB will do very little unless your foot is touching the brake pedal.

* This post was edited 11/24/21 08:54am by an administrator/moderator *

Rollochrome

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Posted: 11/25/21 07:41am Link  |  Quote  |  Print  |  Notify Moderator

I am learning a LOT here

Thanks to all of you


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Cummins12V98

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Posted: 11/25/21 08:36am Link  |  Quote  |  Print  |  Notify Moderator

I will give it a try tomorrow going from Bakersfield over Tehapi Pass.


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