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Old 09-16-2012, 08:59 PM   #1
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Brakes activate in R

Ok I have a dumb question here. When go to back into a camp site or just backup period the brakes activate on my 5er. Can anyone give me any advice on why this may be happening???
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Old 09-16-2012, 09:07 PM   #2
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I would suggest checking the 7-way socket, sounds like there is a short between the "back-up light" lug and the TT brake lug. If you have a second 7-way socket on the bumper try connecting to it and see if the brakes activate in reverse.
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Old 09-17-2012, 08:52 AM   #3
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Could you have the brake controller set to high so that the brakes come on at the slightest touch of the brake pedal? Most people I know when backing ride the brakes slightly. If the controller is set too high/sensitive this might be causing it when you ride the brakes slightly.
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Old 09-17-2012, 09:00 AM   #4
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Sounds like a broken spring on at least one brake, this causes the trailing shoe to pick up the drum while moving backwards.
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Old 09-17-2012, 09:04 AM   #5
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UN hook 7 way then try backing to eliminate the plug issue.
I always back my controller to 0 when I arrive at cg anyway.
If it still does it you have a hardware issue on one of the brakes.

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Old 09-17-2012, 10:17 AM   #6
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Quote:
Originally Posted by DDC View Post
Sounds like a broken spring on at least one brake, this causes the trailing shoe to pick up the drum while moving backwards.
My money is here too.
Ocam's Razor.

The trailer brakes should not engage the drums in reverse.
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Old 09-17-2012, 11:08 AM   #7
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The trailer brakes should not engage the drums in reverse.
Depends on the brake controller. I had a Prodigy and if you wanted the brakes to not work in reverse you would have to hold boost for 5 seconds to disable them.
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Old 09-17-2012, 11:25 AM   #8
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Originally Posted by Len & Cheri View Post
Depends on the brake controller. I had a Prodigy and if you wanted the brakes to not work in reverse you would have to hold boost for 5 seconds to disable them.
Oh, I am sure the magnet is powered in reverse; just from looking at the animated drawing and the way the lever engages the pads it appears it should not work.

In a car, the wheel cylinder applies pressure evenly on both shoes at the top so the shoes will "grab" in either rotational direction. It looks like the magnet applied brake lever only will apply force to both shoes when the rotation is forward.

Been wrong before though and will be again ...
Need a real trailer mechanic (not one who plays one on the internet like me) who works on these guys to jump in.
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Old 09-17-2012, 11:37 AM   #9
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I would go with f1100turbo's solution first, unplug the 7 pin connector and see if the brakes activate in reverse. OP said it activates the BRAKES, not just one, so from that statement, I would suspect the trailer plug or the tv socket has a wire wrong.
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Old 09-17-2012, 11:41 AM   #10
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I would go with f1100turbo's solution first, unplug the 7 pin connector and see if the brakes activate in reverse. OP said it activates the BRAKES, not just one, so from that statement, I would suspect the trailer plug or the tv socket has a wire wrong.
Good point. I just wonder how he knows if it is one brake or all four.
I can't tell if I have a bad brake even going forward unless they lock up (which they should not if the brake controller is set properly).
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