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Electronic over hydraulic braking

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Last activity 2018-10-09 12:19 PM
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heke
Reg. Feb 2004
Posted 2018-10-09 8:32 AM (#171947)
Subject: Electronic over hydraulic braking


Member


Posts: 10

Location: Appleton, Wisconsin
Recently purchased a 4Star4H gooseneck 36 feet on the ground pulling with a 2017 GMC Dually. It has electronic over hydraulic brakes on the trailer. Dealer stated that my settings were not correct in my truck. he said that other customers with GM trucks had to go to the dealer and they had to hook it up with the computer to enable the brakes to send the proper signal for electronic over hydraulic brakes. When I use the manual controller you can hear the brakes being applied. Every GM dealer I've talked to has no idea what I'm talking about. has anyone dealt with this and can you provide any advice on how to communicate to a GM dealer what has to be done?
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Kay
Reg. Oct 2003
Posted 2018-10-09 10:29 AM (#171949 - in reply to #171947)
Subject: RE: Electronic over hydraulic braking


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Posts: 519
500
Location: Zionsville, Indiana
We had that issue with a Ford F350, discovered that we had been pulling a 36' LQ for over a year without functioning brakes. Thank goodness the truck brakes were excellent. Worked with the hand override but not with the brake pedal. Ford dealer was as perplexed as we were. One of our own techs spent a lot of time in the truck fiddling with all the computer setting, and stumbled upon a screen where you could set the controller from "electric brakes" to electric hydraulic brakes". Bingo. Since then we have had several customers with the same issue. Truck dealers/salespeople need to learn about this so that they can tell their customers how to use the darned truck. There are too many bells and whistles for anyone to completely understand everything on their own.

PS. You have to set it back to "electric brakes" if you are pulling a standard electric brake trailer.

Edited by Kay 2018-10-09 10:30 AM
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RTSmith
Reg. Nov 2003
Posted 2018-10-09 12:16 PM (#171951 - in reply to #171947)
Subject: RE: Electronic over hydraulic braking


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Posts: 603
500100
Location: Tenn/Ala.
How new is the trailer? Some older trailers' E/H unit isn't compatible with newer controllers.

Like Kay- found that screen in our Fords. In fact, it is different places between an XLT and Lariat, so I always forget where to find it. There's also a basic Low/Med/High brake effort that has caused problems for our customers. It will get set to Low, they hook up a large trailer and even on 10 have little braking. 

I haven't been into a GMC setup for the E/H setting, but it is present on Dodge. So I'd sure guess it is on the GM platform as well.
 
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RTSmith
Reg. Nov 2003
Posted 2018-10-09 12:19 PM (#171952 - in reply to #171947)
Subject: RE: Electronic over hydraulic braking


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Posts: 603
500100
Location: Tenn/Ala.
 How new is the trailer? Some older trailers' E/H unit isn't compatible with newer controllers.

Also- I know on some occasions a few years ago, it was common on GMs with E/H trailers to install an underdash controller and wire it into the 7 pin plug, disconnecting the Integrated Controller. That can still be done, but frankly I doubt the need.
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