Dorman's Brake Proportioning Valve is quality-engineered to ensure that the correct amount of brake fluid pressure is applied to the rear wheels. Replacement reduces the amount of pressure on the rear brakes, preventing rear wheels from locking up before front wheels during the braking process. All Dorman products are engineered in the United States and backed by 100 years of automotive aftermarket experience. Our solutions are thoroughly tested and inspected, and if you experience any difficulty installing or using our parts, we have a dedicated technical support team of ASE Blue Seal certified professionals ready to help. To learn more about our quality and innovation, visit DormanProducts.com.