•  This valves is to proportion the braking force to the front and rear wheels as ideally as possible for higher safety at the time of the brakes being applied, it controls the brake fluid pressure to the rear brakes according to the load on the rear axle so that the rear end of the vehicle may not spin due to locking of the rear wheels in advance of the fronts.

•  This valve also incorporates a bypass passage that prevents pressure reduction so that rear wheels will still have plenty of braking force to stop the vehicle in the event of a front master cylinder malfunction.