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Open Roads Forum  >  Fifth-Wheels

 > Why aren't my brakes working?

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twins89

Western New York

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Posted: 06/17/12 07:51pm Link  |  Print  |  Notify Moderator

We just got a new to us 2000 f350 dually from a friend who traded his FW for MH. It was all set or so we thought. We cannot get the brakes to become engaged wtih the 7 pin. The brakes worked fine with our old truck (at least I think they did - heard them click) Any suggestions on where to begin to look for the problem; controller, 7 pin etc. The lights on the FW worked fine.


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Chiefcpo

Huntsville, Alabama

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Posted: 06/17/12 08:13pm Link  |  Print  |  Notify Moderator

Does it have a built in trailer brake controller of did the previous owners take it out as it was portable/aftermarker installed. You did not say as that is a starting point. (Yes some of the 2000 did not have them) next is to check the fuses. then check output from the & pin for voltage (above 10 volts depending on the controller you have).

RoyB

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Posted: 06/17/12 08:27pm Link  |  Print  |  Notify Moderator

most of the time you can a tone like thing if you put your head down real close to the trailer wheel when you have someone engage the trailer brakes. If you jake up one side of the trailer the brake will not engage until it is rotated about a 1/4 of a turn on the wheel. Some kind of mechanical thing involved here... You should hear the tone type of sound however without jacking up the wheel on the trailer.

First thing however is look for the brake controller in the truck. Like the other post indicated it may have been removed by the previous owner. Need to look for a manual paddle squeeze switch near your right hand down close to the knee area of the dash... When you are connected and squeeze the switch all the way you should see around 10.0 indicated on the display. If you are not connected to the trailer mine will say "not connected" or something like that...


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Dave&Monica

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Posted: 06/17/12 08:28pm Link  |  Print  |  Notify Moderator

Did you check to see if you have 12V on the brake pin of the connecter on your truck?

Dave


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Sooner Schooner

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Posted: 06/18/12 08:14am Link  |  Print  |  Notify Moderator

Sometimes it's as simple as not getting a good connection, I've had to pull the plug, and put it back in more securely. Also, check for corrosion on the contacts.


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Mile High

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Posted: 06/18/12 10:18am Link  |  Print  |  Notify Moderator

Chiefcpo wrote:

Does it have a built in trailer brake controller of did the previous owners take it out as it was portable/aftermarker installed. You did not say as that is a starting point. (Yes some of the 2000 did not have them) next is to check the fuses. then check output from the & pin for voltage (above 10 volts depending on the controller you have).
I don't think Ford came out with the integrated brake controller until around 2005.

Agree - just start tracing back with a test light. The brake output wire is typically blue.

You should be able to stop the rig with the trailer brakes while traveling around 5mph. If not, somthing is wrong.

partsman01

Poco British Columbia

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Posted: 06/18/12 11:51am Link  |  Print  |  Notify Moderator

have someone put the brakes on and hold a compass by each wheel and see what happens, the compass should react when power comes to the wheel, or you can check amperage at each wheel.

* This post was edited 06/18/12 12:14pm by partsman01 *

Mile High

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Posted: 06/18/12 12:11pm Link  |  Print  |  Notify Moderator

partsman01 wrote:

have someone put the brakes on and hold a magnet by each wheel and see what happens, the compass should react when power comes to the wheel, or you can check amperage at each wheel.
I think you meant hold a compass by each wheel.

partsman01

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Posted: 06/18/12 12:15pm Link  |  Print  |  Notify Moderator

Mile High wrote:

partsman01 wrote:

have someone put the brakes on and hold a magnet by each wheel and see what happens, the compass should react when power comes to the wheel, or you can check amperage at each wheel.
I think you meant hold a compass by each wheel.


Yes, I changed it, thanks.
Should not try and be on when I am at work, have to type without getting caught during work.

64thunderbolt

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Posted: 06/18/12 06:43pm Link  |  Print  |  Notify Moderator

is your new trailer a 3 axle? My friend just went through this. He had an older controller and it would not support 3 axles. He had to replace it with a new one that would.


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