By popular demand, we carry the Russell Brake Proportioning Valve. If you are not using the 4 wheel disc master, then this is the way to go. Let;s you adjust the brake bias with a quick turn of the knob. Russell Brake Proportioning Valve is Adjustable up to a 60% pressure reduction. Utilizes anti-corrosive brass internal components. To install, you simply cut the hard line and install.