Tilton Brake Proportion Valve ScrewTilton screw type proportioning valves enable adjustable brake line pressure reduction to a particular wheel or wheels. They can also be used effectively with single or dual master cylinder systems, providing better front to rear brake balance under both light and heavy braking. Tilton screw type proportioning valve allows for fine adjustments for brake pressure reduction: Knurled adjustment knob for sure grip Fine adjustment set at any point for max