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Trailer Brakes Not Working


piper123

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I have a 2008 GMC Sierra SLT 4X4 Dually

With the ITBC System

 

When hooking up to an older trailer the brake system does not function at all

 

But when hooking up to a newer trailer the system works

 

[The older trailer works my 2006 Dually but the truck doesnt have the ITBC system]

 

Does anyone have any information to help me :P

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