Posted by Mark Robke on July 30, 2013 at 18:23:42 from (67.140.183.179):
In Reply to: Brakes on Navistar posted by NEKS on July 30, 2013 at 06:47:40:
I am guessing you have no brakes on the trailer? As others said the bob-tail proportioning valve is the reason for weak rear brakes. Yes plugging off the red air line and releasing the trailer park knob will increase your rear brake application. There are kits to run air over electric. I have seen them,not impressed, but it would be safer than no trailer brakes. Also ,if you are running no air to trailer, you are running your brakes like a straight truck which requires an inversion valve on the truck. It protects you in case of loss of air primary or secondary side. Your truck may have one(tractors are optionally equipped with inversion valves). I can explain it, and how to tell if you have one,but i would be typing for an hour. I would think also if you have no trailer brakes you may be setting yourself up to jackknife blocking the red airline, but you would have more stopping power. Be careful,good luck. Mark
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