[Fot] Restrictor Valve

[Dennis DeLap]

Friends

Most of our TR3's and TR4's came equipped from the factory with what
Moss calls a restrictor valve - installed in the brake hydraulic line system. 
This valve sits atop the 5way connection that distributes brake fluid to the
front and rear brakes.  Some where in the TR4A run this valve was eliminated. 
Does anyone know the purpose, function, or reason for this valve.

Thanks
Dennis