Hey there's a dash button for it in the new trucks? Sweet!

 

I've had 3 different trucks with exhaust brakes and my '15 F250 is by far the best of the bunch. First was an aftermarket PAC Brake that I put on my '06 5.9 Ram as a means to help warm the truck up. Found that it worked very well slowing the truck either loaded or empty. Rarely had to use the brakes above 25mph.

Second was a 2010 variable vane turbo'd cummins. The stock exhaust brake left a lot to be desired but I didn't have the truck long enough to get a loaded trailer behind it, but it didn't work anything like the PAC brake I had on the '06.

The stock exhaust brake on my F250 works as well if not better at stopping the truck as the PAC brake did. The only thing I'd like to see is the ability to engage it (in park idling) to assist with warming the truck up in the mornings. The stock brake works loaded or empty as long as you keep the RPMs up, and removing gears from the mix (with the +/- selector buttons) helps do just that. I use mine all the time and I love it and IMO Ford hit it out of the park with this feature.

 

thank you and everyone else.....the ford book really doesn't say much on how it works....i don"t run real heavy....just tow my hotrod in my 24 foot enclosed trailer....its nice to know how it works

 

If you guys get a chance, check out the exhaust brake in a new RAM Cummins, works really well. My dad commented every time he felt it working on my truck today, how much he wishes the one in his 2013 F350 worked as well.

 

Why... The new Fords exhaust brake performs better than RAM and is American made to boot.


Ultimate One-Ton HD Challenge: Davis Dam Exhaust Brake Test - PickupTrucks.com Special Reports




Five Millionth Super Duty Is Loaded - PickupTrucks.com News


Care to post a picture of the personnel who built your truck for all to see?

 

Now, I prefer the Ford to the RAM product....but just bear in mind that while the SD is built in Kentucky....the fine powerplant underneath the hood comes from Mexico.

 

And so are other components too. Having said that the F series has the highest percentage of American supplied components and Ford is an American company unlike the RAM.

 

Ok, what is the prime difference between the two???

 

I don't know the answer for sure but my guess is this:

Jake brake actually changes the cam position and valve timing to use the air inside the cylinders in such a way to inhibit crank shaft rotation resulting in aggressive loss of speed.

Exhaust brake leaves the valves/cam system alone and purely uses the turbo to create restriction in the exhaust, sort of like sticking a tennis ball in the tailpipe. The air pressure inside the exhaust manifold is what forces the engine crank to have a harder time turning.

 

That's close. A jake brake or "compression release engine brake" lets go of the air during a compression stroke near top dead center instead of injecting fuel, so that not only are you not generating new energy but the piston travel is creating a vacuum as the piston travels back down, effectively helping to brake the drivetrain and thus the vehicle. http://en.wikipedia.org/wiki/Compression_release_engine_brake
According to the old Mike Rowe narrated videos released by Ford (such as for example) it really just recycles exhaust back into the intake stroke. But 2015 Ford Super Duty | View Super Duty Features | Ford.com says that, "the engine’s back pressure is automatically adjusted, and the transmission holds a specific gear (depending on grade) to help slow the vehicle. For 2015, the new, larger turbocharger provides even more engine-exhaust braking power." It doesn't give super detailed information.

I think the main reason why they don't do a full-on jake brake in these trucks is largely due to them being banned in so many places due to complaints about noise, and they don't trust drivers to control it properly. The exhaust brake at this level of payload works well enough for all but the most extreme tasks and can be used at all times if desired.

 

Thanks to both of you for the info, 'ppreciate it

 

In the Mike Rowe video, it states the process allows "Exhaust gases to enter the cylinders and starve the combustion process." Does that mean these gases are entering via the EGR valve?

If so how does this affect folks who delete and block off the EGR?

Hmmm. something to think about.

I had a B&D Exhaust brake on my 6.0L, It actually had a butterfly valve in the exhaust line that stopped the flow of exhaust gases, creating back pressure. It had a waste gate that allowed excess pressure to escape. The waste gate was set so it released around 39 psi since the valve springs on the 6.0L engine were 40 psi and would float if you got too much back pressure. This Butterfly valve would occasionally carbon up and freeze. Requiring me to climb under the truck and break it free with a open end wrench by moving it through its range of motion with the wrench.

The 6.7L is doing all this with the turbo vanes, where they restrict the exhaust flow and release exhaust gases before the valves float.

 

I like it lots. With the truck camper loaded at 15,000 pounds and NO trailer brakes to assist.
On steep downhills, using tow haul, the truck sometimes picks up speed to where I don't really want it to drop into a lower gear.
Hit the exhaust brake is it slows the truck just enough to avoid using any foot brake.

I don't like the location of the exhaust brake button.
It is below eye level and it is dark color and blends into the dash.

I haven't trained myself to know it's location by feel without looking at it.
It is dangerous to take one's eyes off the road on a curvy downhill road at speed.

 

I've had the very same issue, fumbling around that 12 v socket trying to feel for the button while cresting a hill is a bit interesting. I try to prepare for a descent well before I begin the downhill but still need to watch traffic, lane choice, and of course beginning the descent at 50/55 mph.

 

Allow me to assist: I put a plug in the 12v socket (its for my radar unit) and it keeps me from sticking my finger in it and easy to find the button. I would have liked the button say on the steering wheel...