Deceleration jumping when pulling trailer

[BrittanyG]

I have a 2018 2500, 6.4 Hemi, I had an issue come up this morning I was pulling our 3 horse gooseneck trailer with 2 horses in it and when I would go to slow down, just taking my foot off the gas the truck and trailer would start “jumping”. I’ve pulled this trailer before with no issues, we have had issues with the brakes connecting from the trailer and they weren’t connected on the previous trip but were connected today. However when our older truck pulls it, it’s fine. Wondering if this is a problem with my truck or is it maybe something to do with the trailer brake.

 

[crash68]

when I would go to slow down, just taking my foot off the gas the truck and trailer would start “jumping”. I’ve pulled this trailer before with no issues,

If possible to do this safely, disconnect the trailer brakes to see if the problem goes away.
Do you use the Tow/Haul mode? I suspect it might be something with the transmission/torque converter if the problem persists with the trailer brakes disconnected

 

[BrittanyG]

I do use tow/haul mode. After thinking about it I’m going to see if maybe the gain was up too high, being there was more weight pulling back due to the horses plus the brake was actually staying connected. But I will definitely try this as well, we have plenty of back roads that would be safe to do this on. Thank you.

 

[crash68]

After thinking about it I’m going to see if maybe the gain was up too high, being there was more weight pulling back due to the horses plus the brake was actually staying connected.

you set the gain so that the trailer brakes is just below the point where they lock up when using the manual slide lever at 25 mph. There is also settings on the radio (or EVIC) that allows you to select Heavy or Light electric brakes, Heavy electric is used when the trailer is when the trailer approximately 10K lbs or more. It's explained in the owners manual how to properly set the ITBM.
Many people will over gain the trailer brakes wanting them to "lock up" the trailer tires, that's too much and can cause the trailer control issues.
When these OEM trailer brake controllers are properly adjusted, you won't feel the trailer push or pull on the truck when braking. They use vehicle speed along with braking force in part to determine on how much trailer brake to apply. They also are incorporated with the vehicle stability system to control sway.

 

[BrittanyG]

Yeah I hadn’t been able to do that and thought about it after. As I am the 3rd owner of this truck, and the last time I was towing this trailer the brake wouldn’t stay connected, we think something is wrong with the connector from the trailer as it happens in our older truck as well, but mine has the OEM trailer brake where the older one has a aftermarket. We’ve had no issues but have the trailer brake set in the older truck. And to me it felt like it was pulling back even when I wasn’t actually putting my foot on the brake so I’m hoping that was the issue, that’s a lot easier fix.

 

[crash68]

we think something is wrong with the connector from the trailer as it happens in our older truck as well

If the problem happens on more than one truck then the connection issue is most likely on the trailer.
The OEM controller use PWM to control how much voltage/current to the trailer brakes. It's possible if the trailer brake circuit is partially disconnecting you might be feeling the brake force fluctuate due to the changing electrical load of the trailer brake connection issue.

 

[GTyankee]

The OEM Ram brakes & teknosa aftermarket brakes are definitely 2 different systems & both are almost equally as good
both are set up differently

 

[04fxdwgi]

I went from the Tekonsha Prodigy 3 to OEM integrated brake controller and they feel exactly the same when all is said and done. Only difference is the added settings the P3 need set to get it to feel the same as the OEM.

 

[62Blazer]

It's really hard to diagnose the issue over the internet and very little information. Do you only feel the jumping when on the brakes? Based on the comments about connectivity issues before I wonder if you are getting intermittent power to the brakes. Meaning the jumping is being casued by the brakes on the trailer applying and releasing intermittently if you don't have a good connection.