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Just starting to search for similar threads !   So I own a 2006 gmc 2500hd 6.0l  4x4 and came across a lil problem the other day.  

When the truck is in 4whl drive and I turn the steer wheel 1/4 turn left or right it fully pressurizes brake system  1/8 of a turn  the brakes drag? In 2whl drive truck works fine?????????    I have noticed a small leak at steer box input shaft seal and a small amount at hydrbooster(no drip just moisture )  . I can understand if I have a valve or spool failure in hydro boost but only in 4wheel drive has me a little confused.   I also see that there was a major recall on p/steer and hydro system, but that was up to 2005 and my vin is non applicable according to dealer!    Has anyone else have this or a similar problem??    Thanks in advance ??

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