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Old 08-28-2014, 02:04 AM   #1
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Ford Engine Brake???

Can someone help me understand how the engine brake works on a 2012 Ford F-350 diesel?
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Old 08-28-2014, 02:22 AM   #2
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Chuck, as long as you have the "tow Haul" mode on, when you tap your brake pedal the torque converter locks up and the engine will slow you down. In the Rockies, I put the transmission in the manual mode while descending long steep grades.
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Old 08-28-2014, 02:36 AM   #3
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Dave, what gear do you use going downhill on the steep grades?

Do you use manual on uphill grades, if so, what gear?
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Old 08-28-2014, 03:29 AM   #4
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Actually tow/haul uses transmission braking by automatically downshifting, the exhaust brake blocks/diverts exhaust to retard the engine, you can use it all the time while driving if so desired, but actually works best while in tow/haul. Unless in very steep grades tow/haul with the exhaust brake engaged should not require downshifts. The exhaust brake is a fantastic addition to these newer diesel tow vehicles.
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Old 08-28-2014, 03:32 AM   #5
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The only thing I noticed on my truck is when I have engine brake engaged is sucks down the diesel pretty fast
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Old 08-28-2014, 03:36 AM   #6
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Going down a hill, you should down shift to 5th when you're at the top of the hill and let the truck do the work. If you need to slow down more, as the truck slows down, you can continue down shifting. Once the truck is over speeding it's too late to downshift.

If when climbing hills, the transmission shifts back and fourth between gears, use the manual mode to lock the transmission down. The computer will not allow you to hurt the truck in manual mode.

Remember, you drive a diesel different than a gas engine. A gas engine is quicker to respond to throttle input so therefore you press the accelerator when you need power. On a diesel, you have to plan ahead and wait for the response. The lugging capabilities of the diesel is wonderful going up or down long grades.
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Old 08-28-2014, 03:59 AM   #7
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Dave, I haven't been on any steep hills yet pulling so when you say you switch to manual mode, are you still in tow/haul mode or do you have to get out of that first?
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Old 08-28-2014, 04:00 AM   #8
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Don't know about Ford's, but while going to Branson I was in t/h mode with exhaust brake on I had cruise control set at 60 mph & only lost/gained 3-5 mph in those hills.
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Old 08-28-2014, 04:03 AM   #9
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Ford and Dodge use two different technologies for this. Ford downshifts the transmission and since the turbo is a variable vane it essentially limits the airflow through it acting like an exhaust brake of sorts. With the Ford you'll use no more fuel than while idling in this mode I believe.

In addition to what others have mentioned if you push the down arrow on the shifter column you'll notice the 6 gears that show up on your dash will diminish accordingly. When I encounter steep grades I'll slow down and lock out all the gears necessary to keep the truck at speed. Sometimes I limit it to 3 gears, once I even went to 2 gears for an extremely steep section.

If no gears show up on your panel push the + on the gear lever and they'll show up. Very handy feature.
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Old 08-28-2014, 04:42 AM   #10
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Just learned about that today.

But the 6.7 still has an exhaust brake?
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