https://www.hotrodhotline.com/forsale/parts/brakes Brakes Parts For Sale https://www.hotrodhotline.com/forsale/parts/brakes/not_make_specific/listing/242852 This valve allows the rear brakes to start engaging before the front brakes. Provides a better brake feel for more control. It compliments the proportioning valve. I purchased this valve from Speedway but did not use it. I installed a master cylinder with smaller bore and got the desired result. Brakes