Trailer Brake Controller Issue
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6th Gear
Joined: Jan 2026
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Trailer Brake Controller Issue
I have a 2024 F-350 and cannot set the trailer brake controller high enough to make the wheels lock up. I have the Trailer Brake Effort set to high and the Trailer Brake Gain set to 10. When I slide the controller to activate the trailer brakes the trailer wheels do not lock up. The trailer is a 28 foot Bigfoot travel trailer with dual axles, electric brakes, and 7610 maximum weight. Has any one else had this issue? What am I missing? Pretty sure that to adjust the braking at 20 to 25 mph you turn everything up until the wheels lock up and then back it down until they turn when brakes controller applies brakes to trailer only.
Logistics Pro
Joined: Jan 2010
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Because of how the ITBC works, I don't think you will be able to truly get the brakes to lock up. It works with the ABS system in the truck, which is intended to NOT let the wheels lock up.
In emergency situations, you don't want the tires on the trailer to lock up anyway, as this can lead to loss of trailer control.
I set my electric brakes by finding an empty road, getting to about 35 mph, and trying to stop quickly. If it feels like the truck is getting 'pushed,' the gain is too low and I turn it up. If it feels like the truck is getting 'pulled,' the gain is too high and I turn it down. Ideally the truck and trailer should be stopping evenly, but I would prefer a slight pull over any push at all.
In emergency situations, you don't want the tires on the trailer to lock up anyway, as this can lead to loss of trailer control.
I set my electric brakes by finding an empty road, getting to about 35 mph, and trying to stop quickly. If it feels like the truck is getting 'pushed,' the gain is too low and I turn it up. If it feels like the truck is getting 'pulled,' the gain is too high and I turn it down. Ideally the truck and trailer should be stopping evenly, but I would prefer a slight pull over any push at all.
Fleet Mechanic
Joined: Jul 2019
Posts: 1,651
Likes: 696
Because of how the ITBC works, I don't think you will be able to truly get the brakes to lock up. It works with the ABS system in the truck, which is intended to NOT let the wheels lock up.
In emergency situations, you don't want the tires on the trailer to lock up anyway, as this can lead to loss of trailer control.
I set my electric brakes by finding an empty road, getting to about 35 mph, and trying to stop quickly. If it feels like the truck is getting 'pushed,' the gain is too low and I turn it up. If it feels like the truck is getting 'pulled,' the gain is too high and I turn it down. Ideally the truck and trailer should be stopping evenly, but I would prefer a slight pull over any push at all.
In emergency situations, you don't want the tires on the trailer to lock up anyway, as this can lead to loss of trailer control.
I set my electric brakes by finding an empty road, getting to about 35 mph, and trying to stop quickly. If it feels like the truck is getting 'pushed,' the gain is too low and I turn it up. If it feels like the truck is getting 'pulled,' the gain is too high and I turn it down. Ideally the truck and trailer should be stopping evenly, but I would prefer a slight pull over any push at all.
To the OP, have you had the brakes checked on the trailer? Were you able to lock up the trailer brakes using a different tow vehicle?
I need to reset the gain frequently for my dump trailer as the load is never the same. Always able to lock up the wheels until I had the brake shoes replaced. It took a while for the shoes to bed in such that the wheels would lock up as they once did.
Cross-Country
Joined: Apr 2023
Posts: 85
Likes: 25
my 2023 F250 is the same way. I’ve had it. I have taken it toa couple of different dealerships and they all say test out just fine. I checked all the brakes on my trailer even used it on a different vehicle and that vehicle could lock them up. I’m not totally thrilled with my factory brake controller
Cargo Master
Joined: Apr 2021
Posts: 2,022
Likes: 756
From: Texas
I have a 2024 F-350 and cannot set the trailer brake controller high enough to make the wheels lock up. I have the Trailer Brake Effort set to high and the Trailer Brake Gain set to 10. When I slide the controller to activate the trailer brakes the trailer wheels do not lock up. The trailer is a 28 foot Bigfoot travel trailer with dual axles, electric brakes, and 7610 maximum weight. Has any one else had this issue? What am I missing? Pretty sure that to adjust the braking at 20 to 25 mph you turn everything up until the wheels lock up and then back it down until they turn when brakes controller applies brakes to trailer only.
You should feel trailer slightly pull back on truck
When you brake normally
Panic braking it should come very close to lock up
The system is designed to try to prevent lock up, via modulation of amps to the brakes, based on the info the abs is sensing...its not abs for the trailer
but it is real close
so your trailer does not loose grip on road and slide out of control or cause truck to suddenly gain momentum from sliding trailer
if you squeeze the tbc to full at 3 to 5 mph and if it locks the wheels. Its working.
if it does not...inspect the trailer brakes
also..do you have any dash lights of trailer disconnected etc.
If you have to set gain at real high levels as in max.
to get the slight pull back at normal braking effort
then the brakes need to be inspected at all wheels.
are they disc or shoe style
Shoe style have to be adjusted evenly across all wheels and have just a touch of drag..
Trailer brakes are notorious for not being adjusted
Last edited by powerboatr; Jan 15, 2026 at 09:45 AM.
Logistics Pro
Joined: Jan 2010
Posts: 4,129
Likes: 1,646
iirc
You should feel trailer slightly pull back on truck
When you brake normally
Panic braking it should come very close to lock up
The system is designed to try to prevent lock up, via modulation of amps to the brakes, based on the info the abs is sensing...its not abs for the trailer
but it is real close
so your trailer does not loose grip on road and slide out of control or cause truck to suddenly gain momentum from sliding trailer
if you squeeze the tbc to full at 3 to 5 mph and if it locks the wheels. Its working.
if it does not...inspect the trailer brakes
also..do you have any dash lights of trailer disconnected etc.
If you have to set gain at real high levels as in max.
to get the slight pull back at normal braking effort
then the brakes need to be inspected at all wheels.
are they disc or shoe style
Shoe style have to be adjusted evenly across all wheels and have just a touch of drag..
Trailer brakes are notorious for not being adjusted
You should feel trailer slightly pull back on truck
When you brake normally
Panic braking it should come very close to lock up
The system is designed to try to prevent lock up, via modulation of amps to the brakes, based on the info the abs is sensing...its not abs for the trailer
but it is real close
so your trailer does not loose grip on road and slide out of control or cause truck to suddenly gain momentum from sliding trailer
if you squeeze the tbc to full at 3 to 5 mph and if it locks the wheels. Its working.
if it does not...inspect the trailer brakes
also..do you have any dash lights of trailer disconnected etc.
If you have to set gain at real high levels as in max.
to get the slight pull back at normal braking effort
then the brakes need to be inspected at all wheels.
are they disc or shoe style
Shoe style have to be adjusted evenly across all wheels and have just a touch of drag..
Trailer brakes are notorious for not being adjusted
Something most people don't realize is that the ITBC is NOT like the old pendulum style, or even the Prodigy-style that 'simulate' what the ITBC does. It actually works with the truck brakes, modulating applied voltage based on the brake pedal input to act as ABS for the trailer. And it doesn't WANT to let the tires lock up if the truck is moving, because it means a loss of control.
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6th Gear
Joined: Jan 2026
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shawnee1, Yes, this is what I am trying to do. If I don't get any better choices then I will have the trailer brakes checked. Thanks
Last edited by Rustyturn; Jan 15, 2026 at 10:56 AM.
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6th Gear
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Thealien, I am disappointed to hear this, but not surprised. I hope I can get different results from you but I am not counting on it.
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Fleet Mechanic
Joined: Jul 2019
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I've had the empty dump trailer brakes lock up when braking using the brake pedal. This happened when I forgot to lower the gain after unloading.
Lead Driver
Joined: Jan 2017
Posts: 6,840
Likes: 4,131
From: Jacksonville
Are they electric drum brakes or EOH discs? I have a 30' Diamond C gooseneck w/ EOH discs and I was having issues like you described. The dealer ended up having to install on of these in order for it to work correctly.
https://hydraprousa.com/products/ele...ility-adapter/
For the record, the trailer is equipped with the Deutsche Hydrapro EOH brake actuator.
https://hydraprousa.com/products/ele...ility-adapter/
For the record, the trailer is equipped with the Deutsche Hydrapro EOH brake actuator.
Lead Driver
Joined: Jan 2017
Posts: 6,840
Likes: 4,131
From: Jacksonville
I also have an ATC enclosed trailer with EOH discs but with a different controller. It’s always worked fine. The Diamond C has the controller that’s linked.
Last edited by BowtieConvert; Jan 19, 2026 at 08:02 PM.
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