2020 Cummins IKE pull

^^^ I believe it is only the trucks with ACC that have the capability to apply the wheel and trailer brakes. So it is part of the ACC system but it works regardless of having the cruise set.

Additionally, on the Ford, I can go into the system settings and turn ACC off. With ACC off my cruise works like the old style cruise but the brakes are still applied during CC operation going down hill and during EB operation on steep grades.

4x4ord wrote:

4x4ord wrote:

CaLBaR wrote:

Cummins12V98 wrote:

CaLBaR wrote:

4x4ord wrote:
With the Ford the brake lights only come while the wheel brakes are applied. The Ram is probably the same.

In my owners manual it states that the brake lights come on when the exhaust brake is active letting other drivers know that you are slowing down.

Rob

This must be new for 2019?

Does it say anything about actually applying the truck or trailer brakes when EB is active?

It only says that it will show the brake lights from what I read. I don't have the adaptive cruise control or the towing technology group on mine. From the brochure it does say that the adaptive cruise control will stop the truck so it will apply brakes. Makes sense to me that it would apply brakes with the towing technology groups bells and whistles but will need to look that up. Adaptive cruise control applying truck brakes and no trailer brakes would be dangerous in my estimation so the truck braking with trailer brakes makes total sense to me.

Rob

It applies trailer brakes as well.

As I previously posted I couldn't find any mention of the Auto exhaust brake applying wheel or trailer brakes in the Ford owner's manual yet it definitely does apply both but my suspicion is that it is only on the trucks with adaptive cruise.

From the Owners manual:

Towing A Trailer
ACC while towing a trailer is recommended only with an
Integrated Trailer Brake Controller. Aftermarket trailer
brake controllers will not activate the trailer brakes when
ACC is braking.

It applies the trailer brakes with the Adaptive Cruise Control (ACC) so it if they used the adaptive cruise control going down the IKE the truck would have applied brakes to both truck and trailer to maintain speed if the exhaust brake was not enough.

Rob

4x4ord wrote:

CaLBaR wrote:

Cummins12V98 wrote:

CaLBaR wrote:

4x4ord wrote:
With the Ford the brake lights only come while the wheel brakes are applied. The Ram is probably the same.

In my owners manual it states that the brake lights come on when the exhaust brake is active letting other drivers know that you are slowing down.

Rob

This must be new for 2019?

Does it say anything about actually applying the truck or trailer brakes when EB is active?

It only says that it will show the brake lights from what I read. I don't have the adaptive cruise control or the towing technology group on mine. From the brochure it does say that the adaptive cruise control will stop the truck so it will apply brakes. Makes sense to me that it would apply brakes with the towing technology groups bells and whistles but will need to look that up. Adaptive cruise control applying truck brakes and no trailer brakes would be dangerous in my estimation so the truck braking with trailer brakes makes total sense to me.

Rob

It applies trailer brakes as well.

As I previously posted I couldn't find any mention of the Auto exhaust brake applying wheel or trailer brakes in the Ford owner's manual yet it definitely does apply both but my suspicion is that it is only on the trucks with adaptive cruise.

CaLBaR wrote:

Cummins12V98 wrote:

CaLBaR wrote:

4x4ord wrote:
With the Ford the brake lights only come while the wheel brakes are applied. The Ram is probably the same.

In my owners manual it states that the brake lights come on when the exhaust brake is active letting other drivers know that you are slowing down.

Rob

This must be new for 2019?

Does it say anything about actually applying the truck or trailer brakes when EB is active?

It only says that it will show the brake lights from what I read. I don't have the adaptive cruise control or the towing technology group on mine. From the brochure it does say that the adaptive cruise control will stop the truck so it will apply brakes. Makes sense to me that it would apply brakes with the towing technology groups bells and whistles but will need to look that up. Adaptive cruise control applying truck brakes and no trailer brakes would be dangerous in my estimation so the truck braking with trailer brakes makes total sense to me.

Rob

It applies trailer brakes as well.

Cummins12V98 wrote:

CaLBaR wrote:

4x4ord wrote:
With the Ford the brake lights only come while the wheel brakes are applied. The Ram is probably the same.

In my owners manual it states that the brake lights come on when the exhaust brake is active letting other drivers know that you are slowing down.

Rob

This must be new for 2019?

Does it say anything about actually applying the truck or trailer brakes when EB is active?

It only says that it will show the brake lights from what I read. I don't have the adaptive cruise control or the towing technology group on mine. From the brochure it does say that the adaptive cruise control will stop the truck so it will apply brakes. Makes sense to me that it would apply brakes with the towing technology groups bells and whistles but will need to look that up. Adaptive cruise control applying truck brakes and no trailer brakes would be dangerous in my estimation so the truck braking with trailer brakes makes total sense to me.

Rob

To measure how much better the Cummins exhaust brake is as compared to my Ford here is a test you can perform. I took my truck out and timed how long it took for the exhaust brake to slow the truck from 56 mph to 28 mph and it was 10.7 seconds. I used 56 mph to 28 because 56 mph put me at about 3000 rpm. You have different gear ratios so you'll probably want to go from 52 mph down to 24 mph. I could have clocked it using a higher engine speed because the Ford doesn't redline till 3600 but I thought I would give the Ram a chance;)

4x4ord wrote:

Cummins12V98 wrote:

4x4ord wrote:

Cummins12V98 wrote:
"Cummins: you need 382 reverse HP at the rear wheels of your truck to keep your 33k lb combined unit from accelerating on a 14% grade at 35 mph."

Something does not jive! I was locked in 2nd right against the redline or close to it. You had mentioned that section varied in grade as does the Ike. Who knows, I just know it did what it did.

Makes ya wonder how accurate these signs are????

Makes me wonder if the computer isn't programmed to apply wheel brakes at the engine red line to prevent over revving the engine.

Who knows. May be as it has to protect its self some how!

The only problem I have with this theory is that I kind of doubt that Ram had auto service braking technology in 2015.

I know it does NOT. I’m more thinking it would possibly upshift instead of over reving the engine.

Cummins12V98 wrote:

4x4ord wrote:

Cummins12V98 wrote:
"Cummins: you need 382 reverse HP at the rear wheels of your truck to keep your 33k lb combined unit from accelerating on a 14% grade at 35 mph."

Something does not jive! I was locked in 2nd right against the redline or close to it. You had mentioned that section varied in grade as does the Ike. Who knows, I just know it did what it did.

Makes ya wonder how accurate these signs are????

Makes me wonder if the computer isn't programmed to apply wheel brakes at the engine red line to prevent over revving the engine.

Who knows. May be as it has to protect its self some how!

The only problem I have with this theory is that I kind of doubt that Ram had auto service braking technology in 2015.

Me Again wrote:

4x4ord wrote:

Bionic Man wrote:
The 2020 RAM owners manual is here.

The towing section looks to start at 318. The exhaust brake section is on 230.

I don't see anything that talks about applying brakes when the EB is on, nor applying the brake lights. But I didn't read the whole thing.

I think the idea of all the electronics is to make the trucks simple to operate. Just put it in drive, push the auto EB button and go. The danger of explaining things in the owner's manual is that, unless things are explained to great length, it might confuse more people than it helps. Some would read that the auto button will apply wheel brakes on the down hill grade and think using auto could overheat their brakes. Auto is designed to be used not avoided.


Edit: I looked in my Ford owners manual and like the Ram manual, it says nothing about the Auto EB mode controlling the brake lights or wheel brakes.

I have thought for years the EB should activate the brake lights. I have warned people on group camping trips to be aware that I can slow without brake lights coming on.

NOW, applying the brakes, is something I would not want to occur, or at least provide a setting where one can turn the feature off.

The whole "thing" about having an EB is to have nice cool service brakes available in emergencies. Chris

You don't really need to be able to turn it off. What I mean is: say your truck doesn't have the capability to apply the brakes. You're descending a long steep grade with your 16000 lb RV in tow and you're in 3rd gear at 2900 rpm and 50 mph. Your EB is doing all it can to hold you back but can't quite do it. You've got two choices you can either use the wheel brakes from time to time to keep your speed in check or you can slow down to second gear. 2nd and 3000 rpm will have you at 35 mph.

Now, if your truck has the capability to apply the brakes it's going to choose the first option. So long as you're paying attention you will be aware of the brake applications and can still slow to second gear if you think that would be better.

4x4ord wrote:

Cummins12V98 wrote:
"Cummins: you need 382 reverse HP at the rear wheels of your truck to keep your 33k lb combined unit from accelerating on a 14% grade at 35 mph."

Something does not jive! I was locked in 2nd right against the redline or close to it. You had mentioned that section varied in grade as does the Ike. Who knows, I just know it did what it did.

Makes ya wonder how accurate these signs are????

Makes me wonder if the computer isn't programmed to apply wheel brakes at the engine red line to prevent over revving the engine.

Who knows. May be as it has to protect its self some how!