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To expand on what Chevy Mike said, if you plan to keep the rear proportioning valve in the braking system, it needs to be adjusted properly. There is a little dot (see photo) on the black circular disc which surrounds the splined shaft. With the truck fully assembled but with no load (empty...

I removed my rear proportioning valve years ago when I installed rear disc brakes. Easy, just connect the main line running rearward with the boss on the rear axle that sends fluid to each rear wheel. My truck stops on a dime, even going backwards. Interestingly, I have not replaced the front...

In 1988 GM issued a bulletin to remove that rear proportioning valve. It was Bulletin #88-320-5. Not saying you should or shouldn’t, just trying to be helpful. I removed mine years ago after I installed rear disc brakes. Also it may be helpful to others here on SS if you can post the specific...