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Trailer Brakes Do Not Activate With Brake Pedal When Trailer is Sitting Still  

Question:

I have to get back over to that project and do some more troubleshooting. So, based on answer that I received; " it is possible that the trailer brakes may not apply via depressing the brake pedal while sitting still", what would be the appropriate way to check and see if the trailer brakes are working properly via depressing the foot pedal? Just a reminder, I jacked up the trailer while everything was hooked up, spun the wheels and had someone hit the brake pedal (the tractor had full air pressure), the brakes did not apply. I spun the tires again and had them use the "Controller's" override sliding switch and the brakes locked up immediately. I also learned that the "controller's" green light stays on constantly (even when the key switch is off) and is warm to the touch. This does not seem right to me.

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Expert Reply:

Actually that is a possibility. Proportional brake controllers will not engage the brakes with the pedal unless the tow vehicle is in motion.

Another possibility is the red wire from the brake controller isn't connected correctly. It needs to be connected to the cold side of the stop light switch or the wire that is hot only when the brake pedal is pressed. I would also check any fuses related to towing and replace if necessary.

If none of these ideas solves your problem let me know and we'll continue to troubleshoot.

expert reply by:
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Charles S

Amber

4/13/2020

From what I can tell it seems like it only works when I use the manual lever. But idk for sure because if i use the manual lever i can feel it jolt a little. If i use the break it doesn’t do that. It shows a constant output number but it’s only while I’m moving and it’s constantly changing numbers.

Etrailer Expert

Chris R.

4/15/2020

From what I gather I think your Prodigy controller is actually functioning normally. Seeing a display power output during travel is normal, and it's going to fluctuate based on your deceleration. Using the manual lever will send back full power to the brakes every time, which is why you can feel that "jolt" when applying it. Stepping on the brake pedal will send back power proportionate to your deceleration - so tapping on the brakes as you roll through a quiet neighborhood isn't going to send back an awful lot. What I recommend doing is taking the trailer out to an empty parking lot to really test its performance. Try slamming on the brakes going at a relatively steady pace to see if can feel the brakes grab. Let me know what you find.

Amber

4/15/2020

Awesome I will try that. Thank you so much
Etrailer Expert

Chris R.

4/16/2020

Great! Please don't hesitate to let me know if any issues come up. We're here to help.

Amber

4/11/2020

I just bought a new truck that has one of the Prodigy trailer brakes. My old truck had the same one. As I’m driving it always shows a reading and fluctuates. My new truck does the same thing. So is this normal? I’ve just been turning it all the way down and then when I need them I turn them up and apply manually.

Etrailer Expert

Chris R.

4/13/2020

Is the controller showing a constant brake output number or is it an error message that keeps popping up? Does the controller work at all when you actually step on the brake pedal during travel - or is the manual lever the only thing you're able to use?

Jeff

12/28/2016

I have to get back over to that project and do some more troubleshooting. So, based on answer that I received; " it is possible that the trailer brakes may not apply via depressing the brake pedal while sitting still", what would be the appropriate way to check and see if the trailer brakes are working properly via depressing the foot pedal? Just a reminder, I jacked up the trailer while everything was hooked up, spun the wheels and had someone hit the brake pedal (the tractor had full air pressure), the brakes did not apply. I spun the tires again and had them use the "Controller's" override sliding switch and the brakes locked up immediately. I also learned that the "controller's" green light stays on constantly (even when the key switch is off) and is warm to the touch. This does not seem right to me.

Charles S.

12/28/2016

The wheels spinning wouldn't change anything as to whether the controller will engage the brakes or not. The controller senses the motion of the vehicle, and applies the brakes with the same degree of force that the vehicle is slowing down. If the vehicle (or controller) isn't moving there is no degree of force. The only way to really test it is to drive. The best way is to find an open, empty parking lot and drive slow. The green light staying on depends on the controller. Some, like the Tekonsha Voyager # 39510, will always have a light on as long as the trailer is connected, even with the tow vehicle turned off. To get the light to stop you need to unhook the trailer.

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