5er Brake failure seeking solution
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Logistics Pro
Joined: Nov 2001
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From: Georgia
5er Brake failure seeking solution
I am chasing some sort of electrical failure of my brakes. I have a Ford factory controller.
I have battery voltage to the brakes when the controller switch is manually squeezed and the brakes activate.
I have battery voltage from the breakaway switch and the brakes lock when the stopper is removed.
I have checked the 30 amp under the hood and both 5 amp fuses in the cab. All three are fine.
Is the brake pedal to brake controller connection electrical or is there a manual switch under the dash somewhere.
Electrical is not my long suit and I am open for suggestions. Thanks
I have battery voltage to the brakes when the controller switch is manually squeezed and the brakes activate.
I have battery voltage from the breakaway switch and the brakes lock when the stopper is removed.
I have checked the 30 amp under the hood and both 5 amp fuses in the cab. All three are fine.
Is the brake pedal to brake controller connection electrical or is there a manual switch under the dash somewhere.
Electrical is not my long suit and I am open for suggestions. Thanks
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Logistics Pro
Joined: Nov 2001
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From: Georgia
hi Senix, how you been. I've been out there chasing gremlins and found my MC batteries with the nice green peep hole now have a sort of orange peep hole. Both of them. I know from hanging here and on of my other trucks that these batteries can do some strange stuff when they are going bad. Do you suppose that could be the problem? I will of course check the brake sensor also. Thanks for the help.
Hotshot
Joined: Jan 2010
Posts: 10,060
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From: Bristol, TN.
The initial post is not very clear. Is the problem your trailer brakes do not activate when you are stopping? And it has worked previously? And then it just stopped working? And you knew it was not working because? 
Steve
Steve
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Logistics Pro
Joined: Nov 2001
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From: Georgia
Hey thank y'all. I posted it over on the 6.7 forum and boy am I embarrassed. That brake controller does not activate below 12 MPH or so. I'm checking it parked so of course I get nothing or at least very little. Sorry to waste your time.
Hotshot
Joined: Jan 2010
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From: Bristol, TN.
Steve
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From: Frederick, MD
it reduces output below 11 mph, but should at least show the connection and if you step on the brake pedal you should see a bit of movment on the the TBC output.
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Hotshot
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From: Bristol, TN.
Steve
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Joined: Nov 2001
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From: Georgia
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Joined: Jan 2002
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From: Itinerant
When I hook and before raising the trailer legs all the way up I always apply the brake controller to be sure that the 5th wheel jaws are actually locked and the trailer brakes always lock up. But i did notice that when pulling away and trying the brake controller it barely locks them up. I guess I learned something new today about the truck braking system.
Hotshot
Joined: Jan 2010
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From: Bristol, TN.
When I hook and before raising the trailer legs all the way up I always apply the brake controller to be sure that the 5th wheel jaws are actually locked and the trailer brakes always lock up. But i did notice that when pulling away and trying the brake controller it barely locks them up. I guess I learned something new today about the truck braking system.
Steve
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Logistics Pro
Joined: Nov 2001
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From: Georgia
Oh I'm never embarrassed because of something I don't know. I'm embarrassed about this because I've known this for some time and have even dealt with it once before. Just part of ageing. I'm pretty close to being able to hide my own Easter eggs, maybe next year.
