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Old 08-03-2015, 01:44 PM   #11
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A word of advise about gearing and use of exhaust brakes. General theory about gearing is to keep the vehicle in the same gear going down the grade as you did going up. For example, if the vehicle downshifts to 3rd going up, then keep it in that gear going down and let the exhaust brake do it's thing. They are usually programmed to match the motor and transmission according to how you want them. Also, never ever use the exhaust brake in wet or slick conditions unless you want to see your trailer pass you when descending a steep grade.
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Old 08-03-2015, 02:32 PM   #12
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I found with my 2014 f350 dully I don't have to manually change gears in tow mode. If you keep it in drive and press the break and release while going down hill it will automatically down shift one gear to slow down the truck. If you are still going to fast hit the break again and it will down shift again. I tow a 12k 5er and have gone down both sides of us50 near lake Tahoe and never used the brakes except using this method.
The 2015 Exhaust brake uses variable vanes on the Turbo to hold the exhaust pressure up and works same as a mechanical exhaust brake. Pulled 12,000 pound Toy Hauler with F250 this summer and exhaust brake worked great. Seldom had to touch the brakes except to get it started braking and if it got too fast push brake harder and it will gear on down. Very nice set up. I even used it in the Mountains without the trailer. It will spoil you real fast. It also goes up mountains as easy as it goes down.
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Old 08-03-2015, 02:47 PM   #13
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The 2015 Exhaust brake uses variable vanes on the Turbo to hold the exhaust pressure up and works same as a mechanical exhaust brake. Pulled 12,000 pound Toy Hauler with F250 this summer and exhaust brake worked great. Seldom had to touch the brakes except to get it started braking and if it got too fast push brake harder and it will gear on down. Very nice set up. I even used it in the Mountains without the trailer. It will spoil you real fast. It also goes up mountains as easy as it goes down.
This is just the point I tried to make earlier - they will spoil you to the point they can get you in trouble real fast if you're not alert descending. Remember, as long as you're not using your TV brakes, the trailer brakes aren't in use and the added weight behind you can push you out of control if the rubber isn't firmly on the road!
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Old 08-03-2015, 02:58 PM   #14
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I found with my 2014 f350 dully I don't have to manually change gears in tow mode. If you keep it in drive and press the break and release while going down hill it will automatically down shift one gear to slow down the truck. If you are still going to fast hit the break again and it will down shift again. I tow a 12k 5er and have gone down both sides of us50 near lake Tahoe and never used the brakes except using this method.
On my 2013 SRW 6.7...^^^this is what I do.
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Old 08-03-2015, 03:28 PM   #15
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Originally Posted by j free View Post
I found with my 2014 f350 dully I don't have to manually change gears in tow mode. If you keep it in drive and press the break and release while going down hill it will automatically down shift one gear to slow down the truck. If you are still going to fast hit the break again and it will down shift again. I tow a 12k 5er and have gone down both sides of us50 near lake Tahoe and never used the brakes except using this method.

I didn't manually shift either, I just adjusted the cruise control with the +/- buttons to get the transmission to kick down a gear. I used my brakes a couple of times and heard the engine rev up as it down shifted, nothing unusual and nothing my old 6.0 powerstroke didn't do. What was odd that hadn't happened in the old 6.0 that happened with the '12 was this loud 5-6 second groan at around 3800 rpm's and an instant slow down of about 5mph. I think that was the exhaust brake kicking in or the turbo closing down enough to send out a loud growl. Anybody else hear that while descending a grade, and not just the transmission downshifting and the engine revving higher?


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Old 08-03-2015, 03:52 PM   #16
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I have the 2015 250 SRW. It has the true exhaust brake. I don't really need it pulling our TH until we get into the mountains. It works really well. I actually use the exhaust brake more without the trailer in Atlanta traffic. Helps me stop quicker for sure.
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Old 08-03-2015, 04:23 PM   #17
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This is just the point I tried to make earlier - they will spoil you to the point they can get you in trouble real fast if you're not alert descending. Remember, as long as you're not using your TV brakes, the trailer brakes aren't in use and the added weight behind you can push you out of control if the rubber isn't firmly on the road!
Like anything else if you don't pay attention pulling an RV, you will get in trouble sooner or later. The exhaust brake is not an autopilot, and I would lot rather use it descending than the RV brakes and TV brakes as it doesn't get hot and fade when you need them you still have them. If I am descending at 50 mph I don't let it get over 60 before I slow it down with the brakes well before it gets out of hand and before I am in a curve and have one of those oh no moments. The 15 F250 also has trailer sway control, which I assume will work as haven't had to find out. You are better off in my opinion to use the trailer brakes as little as possible on wet road as they have the ability to lock up and you have a mess then. The truck brakes are anti lock and won't lock up. Turn the trailer brakes way down when wet and stay out of trouble and leave extra room and watch way ahead. If you ever lock the tires up on the trailer it will steer you at that point and bet it won't be where you want to go. Worked for me many years with 12000#'s plus Fifthwheels.
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Old 08-03-2015, 04:59 PM   #18
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Like anything else if you don't pay attention pulling an RV, you will get in trouble sooner or later. The exhaust brake is not an autopilot, and I would lot rather use it descending than the RV brakes and TV brakes as it doesn't get hot and fade when you need them you still have them. If I am descending at 50 mph I don't let it get over 60 before I slow it down with the brakes well before it gets out of hand and before I am in a curve and have one of those oh no moments. The 15 F250 also has trailer sway control, which I assume will work as haven't had to find out. You are better off in my opinion to use the trailer brakes as little as possible on wet road as they have the ability to lock up and you have a mess then. The truck brakes are anti lock and won't lock up. Turn the trailer brakes way down when wet and stay out of trouble and leave extra room and watch way ahead. If you ever lock the tires up on the trailer it will steer you at that point and bet it won't be where you want to go. Worked for me many years with 12000#'s plus Fifthwheels.
Agree Completely!
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Old 08-03-2015, 05:01 PM   #19
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The super duties didn't get a true exhaust brake until the 2015 MY when the second generation 6.7 with a non-wastegated gt37 turbo was released.
Same here, push button on the dash and light illuminates in the centre cluster.
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Old 08-03-2015, 06:05 PM   #20
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I have a Chevy but when I start up and I'm pulling the camper I push tow/haul then the exhaust brake and when I get up to speed I set cruise, coming down Black Mountain which is steep I set the cruise on like 45 and never touch the brake. Is Ford like that?


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