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Old 04-10-2013, 09:36 PM   #1
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TT brakes

We tow a TT that weighs 5K, loaded, with a GMC 2500, Diesel. The truck came with the trailer brake control. Initially, it was set at 5. I've moved it up to 8 and still see no difference in the braking. Is this because the truck is so heavy? Is it because I've got it set correctly? I have absolutely no idea what "trailer gain". followed by numbers and "......" means. That's the indication I get on the dash during braking. Any advice/help will be appreciated.
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Old 04-10-2013, 09:57 PM   #2
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Do the "...." Increase as you apply the brakes harder? If you go down at about 25 mph and apply just the TT brakes manually, does it stop your truck? At some point the gain of the brakes on the TT should lock up the tires.
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Old 04-10-2013, 10:03 PM   #3
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When you say "no difference in the braking", please explain a little. as soon as you move a little, are you letting go of the gas and squeezing the levers together? Your rig isn't stopping?
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Old 04-10-2013, 10:04 PM   #4
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oops...someone already answered this. Man do I type slow! lol,
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Old 04-10-2013, 10:23 PM   #5
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The brakes

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Originally Posted by dalford View Post
Do the "...." Increase as you apply the brakes harder? If you go down at about 25 mph and apply just the TT brakes manually, does it stop your truck? At some point the gain of the brakes on the TT should lock up the tires.
Yes, I have pulled that lever at 25mph and yes, it did lock up the trailer brakes. I released it immediately. I wonder if doing that set the control? No, it did not stop the truck.
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Old 04-10-2013, 10:34 PM   #6
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Well if it locked up the brakes it would eventually stop the truck. What you want to do is lower the gain until you can apply the manual control fully without locking the trailer brakes. Once you do that you know that if you brake hard your trailer will brake to the max without brake lock up.

All that being said, you should be able to feel the trailer brake if you aggressively apply the truck brakes. There is a switch that is triggered by the brake pedal. Make sure that is operating properly.

I never asked. What type of brake controller do you have?
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Old 04-10-2013, 10:37 PM   #7
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Did you pull this TT with another tv before or is all this new to you? Typically when you brake aggressively your trailer will pull down on the rear of your tv...
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Old 04-10-2013, 11:18 PM   #8
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The brake controller came with the truck. It has a lever and buttons labeled plus and minus for TT brake. No name on it. I really appreciate your answers!
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Old 04-10-2013, 11:43 PM   #9
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Sounds like a factory installed unit. I have what sounds like the same unit in my F150. From your posts it sounds like your controller is working in the manual mode since you were able to lock up the brakes with the manual control.

Try this to see if the controller is working properly when you apply the brakes. Turn the gain up high 8 where it locked up with the manual control. Adjust your mirrors so you can see the tires on your trailer. Get up to about 25 and stop quickly using your brake pedal not the manual slide switch and see if the tires lock up (smoke). If they do then your controller is working properly. Now calibrate your brake controller by lowering the gain to say 5. Go 25 mph and slide manual control to max. If smoke, lower to 4, try again. Just do this until your tires don't lock up when you apply the manual control.

If you can't get your tires to lock up when you apply the brakes aggressively, you need to make sure the brake switch is operating properly. I am nor exactly sure how it connects to the brake pedal shaft but my guess would be that it is held closed until you push on the brake pedal and then it opens.

You do also have a significant truck to TT so that does play into what you feel but I would think you should be able to set up to much gain and lock up the brakes on your trailer and know it works.

Hope this helps...
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Old 04-11-2013, 08:56 AM   #10
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idle down the driveway and manually pull the trailer brake lever and you should feel the trailer brakes kick on - and stop the truck, or close to it.

the higher the number the more the brakes on the trailer

My integrated controller is set at 2.5 to 3.0 range - I change it based on feel, load, weather, road, etc. I start on 3 and as the brakes warm I"ll usually move to 2.5.
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