I just finished putting a Wildwood Adjustable Proportioning Valve on my truck. For the first time in years I can get the nose to dip when I slam on the brakes and I have at least 30% more braking power than I previously had. I had recently replaced my rusted out OEM proportioner valve with one from Bronco Graveyard and still had the same symptoms. You could tell that the front brakes were just not coming on. After replacing everything on the front I decided to try the adjustable unit. I can slam on the brakes now without losing control of the truck.