I assume you have the built in factory brake controller? When you check voltage at the back pin have someone depress the brake pedal or squeeze the slide switch. I assume you have set the gain up from zero? You do this by the push buttons next to the manual apply switch. If none of these things help your probably going to need to have a dealer look at it. I know GM had some problems with the rear control modules on the early 07's.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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