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This proportioning valve has six preset adjustment points actuated by moving a lever allowing racers to adjust brake bias during a race without having to "look" where the knob position is. the lever "clicks" into the six positions for positive adjustment and the bright red lever is easily seen in a busy racing cockpit. Lever can be rotated 180º for easy installation and mounting location. Ideal for oval track, road race and off road racing where car and racing conditions change throughout the race.