the proportioning valve/block is where you can adjust the bias front to rear with the fluid pressure...you will use trial and error to get the right pressure front to back, by adjusting it...driving it, braking hard...if the rear end locks up, adjust it untill the front end locks up before the rear brakes lock up (you really do NOT want the rear brakes to ever lock up, because thats when the rear end swings around like your bicycle did when you were a kid and locked the rear tire, and swung ... The proportioning valve only lets a certain portion of the pressure through to the rear wheels so that the front wheels apply more braking force. If the proportioning valve were set to 70 percent and the brake pressure were 1,000 pounds per square inch (psi) for the front brakes, the rear brakes would get 700 psi.
I went to my local Napa and told them I want a 79 trans am with 4 wheel disk brakes master cylinder. Bolts to brake booster easy peasy. Deleted abs, added adjustable proportioning valve. Front calipers are plumbed directly to the master cylinder. Rear goes through proportioning valve. I have jb7 big piston Chevy calipers at all 4 corners. Body Lifts & Mounts for 1966-77 early Ford Broncos. Sleeves, Mounts, Hardware, Lift Kits, and other parts needed when doing a body lift.
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