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Old 01-14-2015, 10:34 PM   #2
undertaker72
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Join Date: Dec 2013
Location: nephi , utah
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Re: Please help. What is this part?

does that truck still have the break control , under the dash , I think what you have there is a pressure control for the trailer brake unit , the older trucks had hyd. type vrs the new truck of today being all electric , this unit you adjust the end knurled nob to gain more pressure or less
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