REMOVAL & INSTALLATION
The dual brake proportioning valve provides two functions. It distributes pressurized brake fluid from the master cylinder to the diagonal brake circuits (left front/right rear and right front/left rear), as well as reducing fluid pressure to the rear brakes under heavy braking.
The proportioning valves are not repairable and should never be disassembled. They rarely fail, and all other causes of a brake problem should be thoroughly investigated before changing this valve.
The valve is located either on the right fender apron or directly below the master cylinder. To remove the valve, label each brake line as to its correct position on the valve. Carefully remove the lines from the valve and plug the lines immediately. Unbolt the valve from its mount. When reinstalling, mount the valve securely. Hand-thread each brake line into its correct port, then tighten the fittings to 10 ft. lbs. (14 Nm) with a flare-nut wrench. Do not overtighten the line fittings.