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StephenH View Drop Down
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Joined: 29 Nov 2015
Location: Wake Forest, NC
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Posts: 6289 		Direct Link To This Post Topic: Brake issue
    Posted: 14 Jun 2021 at 11:21pm
Originally posted by offgrid

The Hayes device works by selectively activating one or the other trailer brakes. If one of the brake magnets isn't connected electrically then the Hayes device won't be able to activate it. I'm not sure what the system would do if it only has one brake to activate but it's likely to behave unpredictably. I think I'd deactivate it as well.
That is incorrect. The Hayes Sway-Master activates both brakes. The Tuson device will selectively activate one side or the other. I have the Sway-Master.
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podwerkz View Drop Down
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Posts: 966 		Direct Link To This Post Posted: 14 Jun 2021 at 9:59pm
Sounds like that's what is happening, but you might want to do the 'skid-pad' test I described just to make sure.
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pedwards2932 View Drop Down
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Posts: 338 		Direct Link To This Post Posted: 14 Jun 2021 at 7:45pm
On our return trip with the brakes turned off and 200 miles temp on driver side 104 and other side was 92.  I turned the controller to 2 and measured at next stop and driver side was 180 and other was about 90.  So I think the passenger side brake is just not working.
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seafans View Drop Down
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Posts: 155 		Direct Link To This Post Posted: 07 Jun 2021 at 9:30pm
I'm on my second Rpod and both had grease in the brakes and magnets when new.  Might only need to be disassembled and cleaned-adjusted.
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offgrid View Drop Down
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Posts: 5290 		Direct Link To This Post Posted: 06 Jun 2021 at 2:34pm
The Hayes device works by selectively activating one or the other trailer brakes. If one of the brake magnets isn't connected electrically then the Hayes device won't be able to activate it. I'm not sure what the system would do if it only has one brake to activate but it's likely to behave unpredictably. I think I'd deactivate it as well.
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pedwards2932 View Drop Down
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Posts: 338 		Direct Link To This Post Posted: 06 Jun 2021 at 1:39pm
Sounds like good advice.....I'm guessing the Hayes Sway control will still work since it isn't part of the brake controller
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offgrid View Drop Down
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Posts: 5290 		Direct Link To This Post Posted: 06 Jun 2021 at 1:03pm
82 is close to the ambient temp. I don't think that brake us working at all. If your's is like mine, the brake magnet wires run down the left side and then make connection over to the right, so there are more connectors between the controller and the brakes on the right side.

As podwerkz suggests, you might want to take a quick look at the crappy insulation displacement connectors and see if any are open/wires hanging.

If it was me I think I'd rather have no trailer brakes than just one side working if I encountered wet or slippery conditions. Things can get pretty squirrelly.....
1994 Chinook Concourse
1995 RV6A Experimental Aircraft
2015 Rpod 179 - sold
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pedwards2932 View Drop Down
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Posts: 338 		Direct Link To This Post Posted: 06 Jun 2021 at 11:09am
This is a 2018 r189.  Driver side was over 200 and the other side was 82 so it may be the other side wasn't working.  I am going to keep a close eye on it when we head home....even with the controller dialed back to 2.5 I can feel the trailer brakes when I stop.  I'll try setting it at zero and see what it does.  Thanks.
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podwerkz View Drop Down
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Posts: 966 		Direct Link To This Post Posted: 06 Jun 2021 at 10:54am
Just FYI...I dont think this is the issue, but if the trailer is brand new (or the brake shoes are brand new) they can be 'out of balance' for awhile until they 'bed in' or become well burnished. 

The so-called 'nevr-adjust' means that sometimes one electric brake will advance and grab a bit sooner during routine or casual braking applications...becoming somewhat warmer, BUT...both brakes should apply fully during 'hard braking' events. 
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offgrid View Drop Down
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Posts: 5290 		Direct Link To This Post Posted: 06 Jun 2021 at 10:14am
What was the temp difference between the two drums? don't expect them to be the same, we're working with crude 1940s tech here. Within about 50 degrees is pretty normal.

200 degrees isn't very hot if you've been using the brakes, so I suspect the cold side isn't engaging, or at least not as much. Most likely it's what podwerkz is suspecting.

To eliminate dragging on the hot brake as the issue, just let things cool off and dial the controller down to zero and drive a few miles. If the hot brake drum still gets hot then it was dragging, if it's cool the the other side isn't engaging.
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1995 RV6A Experimental Aircraft
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